Multiple choice

In a mixture of 25 litres, the ratio of milk and water is 4 : 1. How many litres of milk must be added to make the ratio 16 : 1?

  1. 21

  2. 25

  3. 60

  4. 36

  5. NA
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Initial: 25L, 4:1 ratio -> 20L milk, 5L water. Let x be added milk. (20+x)/5 = 16/1. 20+x = 80, x = 60.

AI explanation

The 25 litres of mixture contains 4/5 milk and 1/5 water, meaning there are 20 litres of milk and 5 litres of water. Let x be the amount of milk to add to achieve a 16 to 1 ratio, so the equation is (20 plus x) divided by 5 equals 16. Solving for x gives 20 plus x equals 80, which means x is 60 litres.

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