Bunuel wrote:
To make lemonade, a recipe requires 4 lemons, 30 ounces of sugar, and 2 pints of water. From an average lemon one can squeeze out 0.4 cups of 5% citric acid. Marta does not have lemons, but wants to make lemonade from 4 cups of 12% citric acid. If she has sugar and water in abundance, how much water will Marta use?
A. 2 pt.
B. 6 pt.
C. 12 pt.
D. 15 pt.
E. 100 pt.
Bunuel,
Need to your help in understanding where I am doing the mistake:
i am converting everything in to 5% concentrate
lets find how much of water will be required to convert the 12% to 5% concentration
12 ---- 0 (pure water)
v
5 .
^
5--------7
5/7= 4/x x= 5.6 pints of water is required to dilute the 12% 4 cups to 5% concentration.
now, 1 lemon can have 0.4 cups of 5% of citric acid, so 4 *0.4 =1.6 cup
so 1. 6 cup require 2 pints of water for actual recipe. So we have 4 cups(already diluted 12% to 5%) will require 5 pints of water
so total water required is 5.6 +5 ==>10.6 (not listed though!)