1. A mixture of 30 litres of spirit and water contains 20% of water in it. How much water must be added to it, to make the water 25% in the new mixture ?
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By: anil on 05 May 2019 02.23 am
% water in 30 litres of mixture = 20% => Quantity of water = $$frac{20}{100} imes30=6$$ litres Let $$x$$ litres of water is added According to ques, => $$x+6=frac{25}{100} imes(x+30)$$ => $$4x+24=x+30$$ => $$4x-x=30-24$$ => $$3x=6$$ => $$x=frac{6}{3}=2$$ $$ herefore$$ 2 litres of water must be added to make the water 25% in the new mixture. => Ans - (B)
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