A Zoo keeper counted the heads of the animals in a zoo and found it to be 80. When he counted the legs of the animals he found it to be 260. If the zoo had either pigeons or horses, how many horses were there in the zoo ?

When a student weighing 45 dgs left a class , the average weight of the remaining 59 students increased by 200...

If 18 is 15 percent of 30 percent of a certain number , what is the number ?

Average cost of 5 apples and 4 mangoes is 36 taka. The Average cost of 7 apples and 8 mangoes is 48 taka. Find...

If n and p are both odd numbers, which of the following must be an even number ?

The present ages of A and B are in the ratio 6 : 4. Five years ago their ages were in the ratio 5 : 3. Find th...

A predator is chasing its prey. The predator takes 4 leaps for every 6 leaps of the prey and the predator cove...