A dairyman pays Rs. 6.40 per litre of milk. He adds water and sells the mixture at Rs. 8 per litre, thereby making 37.5% profit. The proportion of water to milk received by the customers is:

1 : 10

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1 : 12

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1 : 15

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1 : 20

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1 : 19

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Solution

The correct option is A
1 : 10

Mean cost price = Rs. $(\frac{100}{137.5} \times 8) = R s . \frac{64}{11} .$

By the rule of alligation:

$∴$ Required ratio = $\frac{64}{110} : \frac{64}{11} = 1 : 10$

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A dairyman pays Rs. 6.40 per litre of milk. He adds water and sells the mixture at Rs. 8 per litre, thereby making 37.5% profit. The proportion of water to milk received by the customers is:

The correct option is A 1 : 10 Mean cost price = Rs. (100137.5×8)=Rs.6411. By the rule of alligation: ∴ Required ratio = 64110:6411=1:10

The correct option is A
1 : 10

Mean cost price = Rs. $(\frac{100}{137.5} \times 8) = R s . \frac{64}{11} .$

By the rule of alligation:

$∴$ Required ratio = $\frac{64}{110} : \frac{64}{11} = 1 : 10$