At first, a container contained
15 ℓ of water. Gillian added another
12 ℓ of water into the container. Then she used
77 of all the water in the container. How much water did Gillian use? Express your answer as a fraction in its simplest form.
Total volume of water in the container after Gillian added more water into the container
= 15 + 12
= 210 + 510
= 710 ℓ
7 u = 710
1 u = 710 ÷ 7 = 710 x 17 = 110
Volume of water that Gillian used
= 7 u
= 7 x 110
= 710 ℓ
Answer(s): 710 ℓ