Bunuel wrote:

A merchant is trying to make lemonade with 20% lemon juice but he has added too much lemon juice and now has 4 liters of a solution that is 55% lemon juice. How much water does he have to add to make the solution the correct strength?

A. 1.4 liters

B. 1.75 liters

C. 2.5 liters

D. 5.4 liters

E. 7 liters

Amount of lemon in 4 litres of solution = 55% of 4 lts = (55/100)*4 = 2.2 Litres

Now the needed percentage of Lemon = 20%

i.e. 2.2 should serve the purpose of 20% of the total solution

i.e. (20/100)*Total Solution = 2.2

i.e. Total Solution = 11 Litres

so the water that needs to be added = 11 - 4 = 7 Litres

Answer: Option E

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