Question
A 240-litre mixture contains petrol and water, only in
ratio 8:7, respectively. How much water should be added in the mixture so that the quantity of water becomes 40% of quantity of resultant mixture?Solution
Quantity of water in the initial mixture = 240 × (7/15) = 112 litres Quantity of petrol in the initial mixture = 240 × (8/15) = 128 litres Since, we’re not adding petrol, 128 litres of petrol will represent 40% of the new mixture. So, total quantity of resultant mixture = 128 ÷ 0.4 = 320 litres Quantity of water to be added = 320 – 240 = 80 litres
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