Question

On saturday, the ratio of the amount of water sued by Household A to the amount of water used by Household B is 13:5. Household A uses 975 litres of water. Determine the total amount of water used by the two households on Saturday.

Answer 1

We use the proportional method

Let A = water used in household A.

Let B = water used in household B.

A to B = 13 to 5

A = 260 gal

260 to B = 13 to 5

260/B = 13/5

13B = 5 * 260

B = 100

A + B = 260 + 100 = 360

The total is 360 gallons.

Answer 2

1350

Explanation:

A:B = 13:5 = 975:x

x=975/13*5 =375

total =975+375 = 1350