Multiple choice

In a mixture of milk and water the proportion of water by weight was 60\%. If in 50 l of mixture 10 l water was added, what would be the percentage of water?

  1. $45 \frac{1}{2} \%$
  2. $72 \%$
  3. $66 \frac{2}{3} \%$
  4. $35 \%$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the original 50 litre mixture, water is 60% by weight, so water = 0.60 × 50 = 30 litres and milk = 20 litres. After adding 10 litres of water, the total water becomes 40 litres and total mixture becomes 60 litres. The new water percentage is (40/60) × 100 = 66.67% or 66 2/3%.

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