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In what ratio must water be mixed with milk to gain 16 2/3 % by selling the mixture at cost price?

Correct answer: A. 1:6

  • A. 1:6
  • B. 2:3
  • C. 4:3
  • D. 6:1

Explanation

Suppose the mixture contains 6 units of milk and 1 unit of water. Selling 7 units at the cost price of 6 units of milk gives a gain of 1/6 = 16 2/3%, because water contributes no cost. Thus water:milk = 1:6. The likely mistake is option d, 6:1, which reverses the required ratio and would produce a much larger gain.

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