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Concentration Terms

A mixture of ...

Question

A mixture of 40 liters of milk and water contains 10% water. How much water should be added to this so that water may be 20% in the new mixture ?

A

6.5 liters

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B

5 liters

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C

4 liters

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D

7.5 liters

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Solution

The correct option is B 5 liters
Required quantity of water
$= \frac{40 \times (90 - 80)}{80} = \frac{40 \times 10}{80}$
$= 5$ liters
The correct answer is $= 5$ liters

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