A policeman detained four suspects for a theft case. Alex: Hey, I didn’t do it! Ben: Alex did it. Clara: I did not do it! Denis: Ben did it. Only one suspect told the truth. Who was the thief? Answer: Clara. Since only one suspect told the truth, the thief is either Alex or Clara. […]

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There were two twins. One of them was sleeping 8 hours a day, and the other one was sleeping 6 hours a day, every day. They were living like this until they turned 72 years old. How many years did each of them spend sleeping?

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Right now, Dr. Johnson is three times older than his son. When Dr. Johnson was 37 years old, his son was 3 years old. How old are Dr. Johnson and his son now?

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Little Jimmy was so tired of fruit flies, so he decided to catch them all. In 4 days he caught 216 flies, and every day he was catching as many flies as he caught in all previous days. How many flies did Jimmy catch on each day?

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A grandfather is 56 years old and his grandson is 14 years old. After how many years will the grandfather be twice as old as his grandson?

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Dr. Johnson gave $90 to his daughter and son. If his daughter gave $10 to his son from her share of the money, then his son would have had twice as much money as his daughter. How much money did each child originally receive from Dr. Johnson?

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Dr. Johnson was walking in a park and met a family consisting of a grandfather, a father, and a son. Dr. Johnson asked them how old they were. The grandfather said: “All together we are 100 years old”. The father said: “My son and I together are 45 years old, and my son is 25 […]

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Dr. Johnson can drink a container of water in 14 days. If he drinks together with his wife, they can finish it in 10 days. How many days would it take the wife to drink the water from the container if she drinks it alone?

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