Math Riddles Page 25 of 26
Brush up on you math skills by trying to solve these math riddles, math questions and math problems.
241. Take the number of your fingers (10) multiplied by the number of you toes (10) divided by one half and add it to the number of months in a year. What is the total?
10 x 10 = 100 ?1/2 = 200 + 12 = 212.
242. A mother and father have six sons and each son has one sister. How many people are in that family?
243. Jenn has half the Beanie Babies that Mollie has. Allison has 3 times as many as Jenn. Together they have 72. How many Beanie Babies does each girl have?
If Mollie has twice as many Beanie Babies as Jenn and Allison has 3 times as many as Jenn, then the total of 72 must be divided by 6. 72 ?nbsp; 6 = 12. Therefore: Jenn has 12 Beanie Babies, Mollie has 24 Beanie Babies, and Allison has 36 Beanie Babies.
244. Kevin is 14 inches taller than George. The difference between Kevin and Richard is two inches less than between Richard and George. Kevin at 6'6" is the tallest. How tall are Richard and George?
If Kevin is 6'6" tall, George must be 5'4" tall, and Richard must be 6' tall because he is 6" shorter than Kevin and 8" taller than George.
245. A baseball team had just won the championship game and the players wanted to congratulate each other. They began shaking hands, but each player only shook hands with every other player just once. There are, of course, only 9 players on a baseball team. How many times did the players shake hands?
The first player only shakes hands with 8 other players, the second player only shakes hands with 7 other players ( he already shook hands with the first player!), the third player only shakes hands with 6 players ( he already shook hands with the first player and second player ), and so on, until the last player who only has one possibility left. Therefore: 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 36.
246. A jar has 4 amoebas in it to start. Amoebas split their cells in two ( therefore doubling in size) once every minute. The jar will be completely filled in 10 minutes. How long would it take to fill the same sized jar if had 8 amoebas in it to start?
247. There are 100 golfers in the local match play contest. If a player loses a match, he is immediately eliminated from the contest. How many matches will be played to determine the winner?
If there is to be only one winner, then there are 99 loses, therefore there were 99 matches. You can also do this with math: in round 1 there would be 50 matches to produce 50 winners, round 2 would have 25 matches to produce 25 winners, round 3 would have 12 matches to produce 12 winners ( one person of the 25 winners would have to wait until later to play again ), round 4 would have 6 matches to produce 6 winners, round 5 would have 3 matches to produce 3 winners, round 6 would have 2 matches ( the player left out before would now play to make it an even field ) to produce 2 winners, these 2 would play for the championship. So: 50 + 25 + 12 + 6 + 3 + 2 + 1 = 99.
248. Two trains are on a head on collision course. The trains are currently 65 miles apart. The north bound train is traveling at 55 miles per hour and the south bound train is traveling at 80 miles per hour. What is the distance between the trains two minutes before they collide?
If the trains are moving toward each other we combine their speeds to give us their speed basis. So: 55 + 80 = 135 mph. Divide this speed by 60 minutes to give the speed they are traveling each minute = 2.25 miles/minute. Therefore: 2 minutes before impact they are 4.5 miles apart.
249. A car travels at a speed of 30 mph over a certain distance, and then returns over the same distance at a speed of 20 mph. What is the average speed for the total trip?
24 mph. Most people are quick to answer 25 mph, but this is not correct, as we will see. Let the distance traveled be 60 miles each way. Then, the trip out = 60/30 = 2 hours, and the trip back = 60/20 = 3 hours. Therefore: the 120 mile trip = 120/5 = 24 mph.
250. A woman has 100 yards of cloth on a single roll, and she wants to divide it into 100 lengths of 1 yard each. It takes her 3 seconds to cut each length. Working non-stop, how long will it take her to cut all 100 pieces?
The answer is 297 seconds, not 300 as most people would suppose. This is because the 100 pieces are made in 99 cuts. The last cut made results in 2 pieces instead of only one piece.