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प्रश्न
A 90 kg solution has 10% salt. How much water must be evaporated to have the solution with 20% salt?
उत्तर
Quantity of solution = 90kg
Quantity of salt
= `90"kg" xx (10)/(100)`
= 9kg
Let x kg of water be ecaporated.
Therefore,
`(9)/(90 - x) = (20)/(100)`
⇒ 900 - 1800 - 20x
⇒ 20x = 900
⇒ x = 45
Therefore, 45kg of water must be evaporated.
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