Math riddles are a scary territory to many. Math is already a science of problems, tricky statements, abstract imagination, and heavy thinking, could it also be fun? The answer is yes, and proof can be found ahead. Will the numbers be your friends or your doom? Psst, we’ll give you a hint: if it looks like you have to do a lot of calculations, then the solution might not require calculations at all!
Math Riddles
A kind man comes across a dirty box, a voice says to him “Coconuts, $5 a dozen”With his lightning quick arithmetic he calculates that if he sold those same coconuts to the coconut air assault team for the accepted rate of $3 per dozen that in no time at all he would be a millionaire. What's with this guy, assuming his math is accurate?
Answer: He was a billionaire
What year comes next in this sequence: 1973 1979 1987 1993 1997 1999
Answer: 2003: they are prime years
Three people check into a hotel. They pay $30 to the manager and go to their room. The manager suddenly remembers that the room rate is $25 and gives $5 to the bellboy to return to the people. On the way to the room the bellboy reasons that $5 would be difficult to share among three people so he pockets $2 and gives $1 to each person. Now each person paid $10 and got back $1. So they paid $9 each, totalling $27. The bellboy has $2, totalling $29. Where is the missing $1?
Answer: We have to be careful what we are adding together. Originally, they paid $30, they each received back $1, thus they now have only paid $27. Of this $27, $25 went to the manager for the room and $2 went to the bellboy
How many months have 28 days?
Answer: All 12 of them.
A car's odometer shows 72927 miles, a palindromic number. What are the minimum miles you would need to travel to form another?
Answer: 110 miles. (73037)
Three guests check into a hotel room. The manager says the bill is $30, so each guest pays $10. Later the manager realizes the bill should only have been $25. To rectify this, he gives the bellhop $5 as five one-dollar bills to return to the guests. The bellhop realizes that he cannot equally divide the five one-dollar bills among the three guests, so he just gives each guest $1 back and keeps $2 as a tip for himself. As each guest got $1 back, each guest only paid $9, bringing the total paid to $27. The bellhop kept $2, which when added to the $27, comes to $29. So if the guests originally handed over $30, what happened to the remaining $1?
Answer: The $27 paid already includes the bellhop's tip, so $27 + 3x$1 in hand makes $30.
In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly. The Question: How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly?
Answer: It is not possible to guess only three fruits correctly: the fourth fruit is then correct too! So nobody has guessed three fruits correctly and 123-43-39-31 = 10 people have guessed four fruits correctly
Daniel, my son, is exactly one fifth of my age. In 21 years time, I will be exactly twice his age. My wife is exactly seven times older than my daughter, Jessica. In 8 years time, my wife will be three times older then Jessica. How old are Daniel and Jessica now?
Answer: Daniel is 7 years old and Jessica is 4 years old
If a wheel has 64 spokes, how many spaces are there between the spokes?
Answer: 64. The space that comes after the 64th spoke, would be just before the first spoke
A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?
Answer: It was 1/2 its Max height in year 9 so.. Nine Years. Because on the 10th year it doubled for the last time and reached the maximum height
If someone says to you, “I'll bet you $1 that if you give me $2, I will give you $3 in return“, would this be a good bet for you to accept?
Answer: No. This is a situation where you lose even if you win. Assuming the other person is being wise, they would take your $2 and say, “I lose“, and give you $1 in return. You win the bet, but you're out $1
You have the misfortune to own an unreliable clock. This one loses exactly 24 minutes every hour. It is now showing 3:00am and you know that is was correct at midnight, when you set it. The clock stopped 1 hour ago, what is the correct time now?
Answer: 6:00am: since the clock is losing 24 minutes every hour, for every real hour that has passed, the clock will only show 36 minutes. Since the clock shows 3:00am, we know that 180 clock minutes have passed. This therefore equals 300 real minutes and hence 5 hours. The clock stopped 1 hour ago and the time must now be 6.00am.
What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 of 1,000?
Answer: One hundred - work backwards and you will understand
A certain number has three digits. The sum of the three digits equals 36 times this number. Seven times the left digit plus 9 is equal to 5 times the sum of the two other digits. 8 times the second digit minus 9 is equal to the sum of the first and third. What is the number?
Answer: This one is fairly easy - 324 is the answer
While on my way to St. Ives, I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kitten, cats, sacks, wives, How many were going to St. Ives?
Answer: Just one, me.
A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?
Answer: 50 years old
Find the four digit number in which the first digit is one fourth of the last digit, the second digit is 6 times the first digit, and the third digit is the second digit plus 3.
Answer: 1694
A clock chimes 5 times in 4 seconds. How many times will it chime in 10 seconds?
Answer: 11 times. It chimes at zero and then once every second for 10 seconds
Walking home one day, you take a short cut along the train tracks. The tracks cross a narrow bridge over a deep gorge. At the point you are 3/8 of the way across the bridge, you hear the train whistle somewhere behind you. You charge across the bridge, and jump off the track as the train is about to run you down. As it happens, if you had gone the other way, you would have reached safety just before being run over as well. If you can run ten miles per hour, how fast is the train moving?
Answer: The train is moving at 40 miles per hour. Imagine that a friend is walking with you. When the train whistle blows, you head away from the train, he heads toward it. When he reaches safety, you will be 6/8 (or 3/4)of the way across the bridge, and the train will have just reached the bridge. For the train to cross 4/4 of the bridge in the time you cross the remaining 1/4, the train must be moving four times your speed
If you toss a die and it comes up with the number one 9 times in a row, what is the probability that it will come up with one on the next throw?
Answer: One in six. A die has no memory of what it last showed
When asked how old she was, Suzie replied, “In 2 years I will be twice as old as I was 5 years ago.” How old is she?
Answer: Use some math remember in 2 yrs she's twice as old She's 12 ! 14yr / 2yr = 7yr add 5yr and get 12 years old
Numbers and calculations can be daunting to many, so it’s quite normal to see people try to stay clear of any math riddles, for fear of making a fool of themselves. What they fail to understand is that riddles are never meant to make anyone look or feel dumb. They are deceivingly difficult to surprise everyone and prompt a good chuckle once the answer is revealed. That is also the case here. The harder the question looks, the more obvious and simple the answer is likely to be. And are you even sure that these problems have numbers in their solutions?
Last Updated: Wednesday, April 17, 2024
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