Question

A family used 10% of the water in a tank each day. If there was 200 liters of water in the tank, how much water was left after two days' use?

Answer 1

after first day use of water remain=200-(10%of200)=180
after second day use of water remain=180-(10%of180)=162

Answer 2

20 liters because 10% of 100 is 10 so 10%of 200 is 20