Arithmetic Reasoning - General Questions

18 poles are fixed in a straight line, 7 m apart. What is the distance between the first and the last pole?

In a farm there are hens and cows. If the heads number 21 and the legs number 52, how many hens are there?

A teacher has 77 chocolates. If she gives 5 chocolates to each student, she is 3 short. How many students are there?

In a farm there are hens and cows. If the heads number 57 and the legs number 150, how many hens are there?

A clock takes 21 seconds to strike 8. How long will it take to strike 10?