A shopkeeper procures milk at the cost of Rs. 60 per kg. After adulterating it with water (free cost), he sells the milk to the customers at the price of Rs. 62 per kg. and makes a profit of 10%. In what ratio does he mix milk and water?
A56 : 1
B31 : 2 ✓ Correct
C59 : 1
D41 : 1
Correct answer: (B) 31 : 2
Explanation
The ratio of milk to water is 31:2.
A 10% profit means cost per kg of mixture = 62/1.1 = 56.36.
Only milk costs money, at Rs. 60 per kg.
60 x milk-fraction = 56.36 gives milk-fraction = 31/33.
So milk : water = 31 : 2.
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