Mixture and Alligation

Quantitative Aptitude (CGL)

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If 80 litres of milk solution has 60% milk in it, then how much milk should be added to make milk 80% in the solution?

This questions was previously asked in

SSC CGL Tier 2 March 6, 2023 Paper 1

70 litres

50 litres

60 litres

80 litres

- The initial solution is 80 liters with 60% milk. This means there are 48 liters of milk initially (0.6 * 80 = 48).

- The goal is to have an 80% milk solution.

- Let x be the amount of milk to add. The total milk becomes (48 + x), and the total solution becomes (80 + x).

- The equation for the new concentration is:

\frac{{48 + x}}{{80 + x}} = 0.8

- Solving for x:

48 + x = 0.8 \times (80 + x)

48 + x = 64 + 0.8x

0.2x = 16

x = 80

- Therefore, 80 liters of milk should be added.

Answer: Option 4 - 80 liters