Multiple choice

Joe, a milkman, has 100 liters of milk and water solution that contains 60% milk. What quantity of water (in liters) should he add to the solution to bring down the concentration of milk to 30%?

  1. 110

  2. 100

  3. 10

  4. 300

  5. 320
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial milk = 60 liters. Let x be water added. New total volume = 100 + x. Milk concentration = 60 / (100 + x) = 0.3. 60 = 30 + 0.3x => 0.3x = 30 => x = 100.

AI explanation

The initial 100 liters of solution contains 60% milk, meaning there are 60 liters of milk. Let the added water be X liters, making the new total volume 100 plus X liters. Since the concentration drops to 30%, 60 divided by (100 plus X) equals 0.30, which gives X as 100 liters.

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