Question
40 litres of a mixture of milk and water contains 10% of water, the water to be added, to make the water content 20% in the new mixture is :
Answer: Option A Answer: (a)Water content in 40 litres of mixture = $40 × 10/100$ = 4 litresMilk content = 40 – 4 = 36 litresLet x litres of water is mixed. Then, ${4 + x}/{40 + x} = 20/100$${4 + x}/{40 + x} = 1/5$20 + 5x = 40 + x4x = 20 ⇒ x = 5 litres
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