Multiple choice

A container contains milk and water in the ratio of 1:x. When 300 liter of milk and 50 liter of water are added to the mixture the ratio of milk and water becomes 7:3. What is the value of x?

  1. 1

  2. 2

  3. 5

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

Let initial milk be m liters. Then initial water is mx liters (since ratio is 1:x). After adding, the ratio becomes (m+300)/(mx+50) = 7/3. Substituting x=2 gives m=50, which satisfies the equation and makes both quantities positive.

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