Multiple choice

In 40 litres of milk and water the ratio of milk to water is (7 : 1). To get a new mixture containing milk and water in the ratio (3 : 1), the quantity of water that should be added to the mixture?

  1. 6

  2. 6.5

  3. 6.67

  4. 13.5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In 40 liters with milk:water ratio 7:1, milk = 35 liters, water = 5 liters. Let x be water added. New ratio is 3:1, so 35/(5+x) = 3/1. This gives 35 = 15 + 3x, so 3x = 20, and x = 6.67 liters approximately.

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