Arithmetichard · Past Paper
In a mixture of 30L, ratio of milk and water is 7:3. How much water is added to make it 3:7?
A40 L
B30 L
C20 L
D10 L
✓ Correct Answer: A — 40 L
Milk = 21, Water = 9. 21/(9+x) = 3/7 => 147 = 27 + 3x => 3x = 120 => x = 40.
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