Arithmetic Reasoning - General Questions

A teacher has 165 chocolates. If she gives 7 chocolates to each student, she is 3 short. How many students are there?

A teacher has 244 chocolates. If she gives 19 chocolates to each student, she is 3 short. How many students are there?

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

A clock takes 54 seconds to strike 10. How long will it take to strike 16?

A boy buys 7 notebooks at Rs. 12 each and pays with Rs. 100. How much change does he get?