Grandpa Jones says:“My son Adam is 24 years younger than I and 35 years older than my grandson, Joey. Together our total ages add up to 100.”Can you figure out the age of each one of them? AnswerGrandpa Jones was 24 when Adam was born and Joey was born 35 years later, so Grandpa has […]
Sally and Anna took turns multiplying numbers. Sally picked the number four. Anna multiplied that by 4 to get 16. Sally multiplied that by 4 to get 64. Anna multiplied that by 4 to get 256.After going back and forth several times, one of them got the number 1,048,576. Who came up with that number—Sally
You are at a birthday party and the cake is brought in. The birthday candles on the cake are in a pattern: red, yellow, red, yellow, blue, red, yellow, blue, green. The pattern continues, adding pink, orange, purple and white candles.How many candles are on the cake in all? Answer The Pattern: red, yellow,red, yellow,
Mr. and Mrs. Crazy recently had their concert, and they wanted to know how much their total income was. After calculating that they earned $95, they figured out that 100 people attended their concert. If each child paid 50 cents, each pensioner paid $2.50, and adults paid $10 each, how many children, pensioners, and adults
About 2000 B.C. there lived Ahmes, a royal secretary and mathematician of the Pharaoh Amenemhat III. In 1853, an Englishman Rhind found one of Ahmes’s papyruses near the temple of Ramses II in Thebes. The papyrus is a rectangle 33 cm wide and about 5 m long. There is the following Mathematical brain teaser on
Outside the lost city of Xaitec, archaeologists have noticed three rings of large stones, each with a straight line of stones beside it. Twins Sari and Devon have been asked by the chief archaeologist to see whether there may be a connection between the rings and the lines. The twins decide to determine the diameters
There is a certain club which is for men only. There are 600 men who belong to this club and 5% of these men wear one ear-ring. Of the other 95% membership, half wear two ear-rings and the other half wear none. How many ear-rings are being worn in this club? AnswerSix hundred. We know
Josh is writing a book. He starts on page 1. When he finished, he used a total of 228 digits. How many pages does he have? Answer112 pages.
A priest sent a courier from Rome to Venice to reach Venice in 7 days. At the same time, the Mayor of Venice sent a courier to Rome to reach Rome in 9 days. The distance was 250 miles. In how many days will they meet?HintThe speeds of the couriers are 250/7 and 250/9 AnswerThe
A girl is twice as old as her brother and half as old as her father. In 22 years, her brother will be half as old as his father. How old is the daughter now? AnswerShe is 22. Her brother is 11 and her father is 44. In 22 years, her brother would be 33
Michael has five bags of candies to give out. Four of the bags have a total of 84 candies. The fifth contains four candies less than the average of the five bags. How many candies are in the fifth bag? AnswerSixteen
Professor X has managed to create a simple programme that can multiply any two whole numbers and calculate the answer correctly.But, a problem has arisen; it seems the programme will not correctly multiply a number by itself (such as 4 X 4).Fortunately, the professor knows a way to get around this glitch.Keeping in mind that
Rob and Bob played a challenging game several times, betting one pebble on the outcome every time. Rob won seven pebbles, while Bob won seven times. There were no ties.How many times did they play? AnswerIf Rob is up seven pebbles, that means he has won seven more times that he has lost. He lost
Grandpa says, “My grandson is about as many days as my son is in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 100 years. Can you tell me my age in years?” AnswerThis problem is conveniently solved by writing down the necessary
Quentin is a man who writes puzzle books. His editor gives him a task for his next book. He must produce 500 puzzles in the space of 80 days. He has created 300 puzzles already. However, he has been working slower than normal, producing an average of 15 puzzles for every 4 days. How fast