Question

How many quarts of pure pineapple juice should Theo add to a 20% pineapple drink to create 5 quarts of a 50% pineapple juice mixture
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Answer 1

1.875 quarts of pure pineapple juice should Theo add to a 20% pineapple drink.

Explanation

Suppose,  $x$ quarts of pure pineapple juice should be added with 20% pineapple drink.

As the amount of the mixture is 5 quarts, so the amount of 20% pineapple drink will be: $(5-x) quarts$

Percentage of juice in the pure pineapple juice is 100% and in the mixture is 50%

So, the equation will be.....

$1.00(x)+0.20(5-x)=0.50(5)\\ \\ 1.00x+1-0.20x=2.50\\ \\ 0.80x=2.50-1\\ \\ 0.80x= 1.50\\ \\ x=\frac{1.50}{0.80}=1.875$

So, 1.875 quarts of pure pineapple juice should Theo add to a 20% pineapple drink.