Pure milk costs Rs 20 per litre. After adding water the milkman sells the mixture at the rate of Rs 18 per litre, thereby making a profit of 25%. In what ratio does he mix the two ?

18 : 7

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18 : 5

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12 : 7

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12 : 5

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None of these

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Solution

The correct option is A 18 : 7
Mean cost price $= R s (\frac{100}{125} \times 18) = R s 14.4$ per litre. By the rule of alligation
CP of 1L : CP of 1L water

Required rate = 144 : 56 = 18 : 7

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Pure milk costs Rs 20 per litre. After adding water the milkman sells the mixture at the rate of Rs 18 per litre, thereby making a profit of 25%. In what ratio does he mix the two ?

The correct option is A 18 : 7Mean cost price =Rs(100125×18)=Rs 14.4 per litre. By the rule of alligation CP of 1L : CP of 1L water Required rate = 144 : 56 = 18 : 7

The correct option is A 18 : 7
Mean cost price $= R s (\frac{100}{125} \times 18) = R s 14.4$ per litre. By the rule of alligation
CP of 1L : CP of 1L water

Required rate = 144 : 56 = 18 : 7