Question

On a Saturday the ratio of the amount of water used by Household A to the amount of water used by Household B was 13:5.Household A used 260 gallons of water for that day.find the total amount of water used by the two household on that Saturday

Answer 1

Use a proportion.

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.