At first, a container contained
15 ℓ of water. Hilda added another
14 ℓ of water into the container. Then she used
79 of all the water in the container. How much water did Hilda use? Express your answer as a fraction in its simplest form.
Total volume of water in the container after Hilda added more water into the container
= 15 + 14
= 420 + 520
= 920 ℓ
9 u = 920
1 u = 920 ÷ 9 = 920 x 19 = 120
Volume of water that Hilda used
= 7 u
= 7 x 120
= 720 ℓ
Answer(s): 720 ℓ