The question requires finding the number of cups of water he will need
Ratio of parts water to parts lemon juice in lemonade is 5:2
water = 5
lemonade = 2
Total ratio = 5 + 2
= 7
let
total quantity of Quinten = x
cups of lemon juice = ratio of lemon / total ratio × x
10 = 5/7 × x
10 = 5/7x
divide both sides by 5/7
x = 10 ÷ 5/7
x = 10 × 7/5
= (10 × 7) / 5
= 70/5
x = 14
So,
cups of water = ratio of water / total ratio × x
= 2/7 × 14
= (2 × 14) / 7
= 28/7
= 4
Therefore, cups of water needed = 4
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