Question

The capacity of a water container is 25 litres. By the end of the day the remaining water is 5 litres less than the water used. What is the quantity of water used if the container was full initially?

Answer 1

Define x:

Let the water used be x

The water that remain = x - 5

Form equation and solve for x:

The capacity of the container is 25 litres

x + (x - 5) = 25

x + x -5 = 25

2x - 5 = 25

2x = 30

x = 15 litres

Answer: 15 litres of the water is used.

Answer 2

Let the quantity of water used be x

The water that remain = x - 5

Form equation and by solving for x:

The capacity of the container is 25 liters

x + (x - 5) = 25

x + x -5 = 25

2x - 5 = 25

2x = 30

x = 15 liters

Therefore, answer: 15 liters is the quantity of water is used.