Question

A solution of sugar syrup has 15% sugar. Another solution has 5% sugar. How many litres of the second solution must be added to 20 L of the first solution to make a solution of 10% sugar.

Answer 1

Let $x$ Litres of second solution is required to be added

According to question $\frac{15}{100}\times 20+\frac{1}{20}\times x=$ ($x+20$ ) $\frac{1}{10}$

Solving we get $x=20$ L