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A milkman adds 10 liters of water to 10 liters milk. His son takes 15 liters of milk and adds 5 liters to it. Whats is the amount of water (in liters) in this final mixture?

A milkman adds 10 liters of water to 10 liters milk. His son takes 15 liters of milk and adds 5 liters to it. Whats is the amount of water (in liters) in this final mixture?

  • (A) 12.5 L
  • (B) 15.5 L
  • (C) 13.8 L
  • (D) 17.5 L
  • Solution: The milkman combines the milk and the water in a 1:1 ratio: 10 L of milk and 10 L of water, for a total of 20 L.
  • The milkman’s son takes 15 L of the mixture. The mixture was already mixed 1:1, so the 15 L of the mixture contains 7.5 L of milk and 7.5 L of water.
  • 5 L of the water are then added to the 15 L of the mixture. The amounts are now: 7.5 L of milk and 7.5 L + 5 L = 12.5 L of water.
  • The total amount of water in the mixture is 12.5 L.
  • Answer: 12.5 L.
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