In 30 litres mixture of milk and water, the ratio of milk and water is 7:3.…
2021
In 30 litres mixture of milk and water, the ratio of milk and water is 7:3. What would be the quantity of water to be added in the mixture in order to make this ratio 3:7?
- A.
40 litres
- B.
42 litres
- C.
45 litres
- D.
None of these
Attempted by 19 students.
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Correct answer: A
Initial mixture is 30 litres with milk and water in ratio 7:3.
Milk = (7/10) * 30 = 21 litres. Water = (3/10) * 30 = 9 litres.
Let x be the water added. Milk remains 21 litres. New ratio is 3:7 (Milk:Water). Equation: 21 / (9 + x) = 3 / 7.
Solving: 147 = 27 + 3x => 120 = 3x => x = 40 litres.
Therefore, 40 litres of water must be added.