Question

Brand I solution of sugar syrup as 15% sugar and another brand II, solution has 5% sugar. The quantity in litres of he second solution, must be added to 20 litres of first solution to make a solution of 10%, is:
1. 5
2. 10
3. 15
4. 20

Answer 1

Correct Answer - Option 4 : 20

Given 

Percentage of sugar syrup  = 15%

Percentage of another sugar syrup  = 5%

If 20 litres of first solution to be added = ?

Calculation :

Let a litres of second solution is required to be added 

according to the question (15/100) × 20 + (1/20) × a  = (a + 20)1/10

solving we get a = 20 litres 

∴ The required answer is 20 litres.