A man walked by an old fisherman and asked him how many fish he had caught. The fisherman replied: "The half of the eight, the nine without its tail, and the six without its head." How many fish did the fisherman caught?

A tree is 20 meters tall. An ant is climbing it. Every day the ant climbs 5 meters, and each night it descends 4 meters. In how many days will the ant reach the top of the tree?

A bar of soap is placed on one of the sides of a pair of scales. On the other side there is 3/4 of a bar of the same soap and а 3/4 kg metal weight. The scales are in balance. How much does a bar of soap weigh?

There are three sorts of apples in a basket. How many apples have to be taken from the basket, without looking, to be sure that there are at least 2 apples of the same sort?

A boy and a pig weigh as much as 5 crates. The pig weighs as much as 4 cats. 2 cats and the pig weigh as much as 3 crates. How many cats weigh as much as the boy?

There are three lemons. One of them is lighter than the other two, which have the same weight. Can we tell which of the lemons is the lighter one with just one measurement on the scales?

Several rabbits and hens are placed together in a cage. How many rabbits and hens are there, if the total number of their heads is 35, and the combined number of their legs is 94?