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25 Oct 2020, 03:37
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Let's say that 100 liters of milk cost him Rs.100
For him to gain 20%, milk should be 100/1.2 =1000/12 = 250/3
Water should be 100 - 250/3 = 50/3
So, milk:water = 250:50 = 5:1
For him to gain 20%, milk should be 100/1.2 =1000/12 = 250/3
Water should be 100 - 250/3 = 50/3
So, milk:water = 250:50 = 5:1
RamTee
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25 Oct 2020, 05:51
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This question was simple (I felt).
Assumption X litres of milk cost M$
Addition of Y litres of water. What the question is asking is X:Y.
X costs m$
X+Y costs 1.2M $
Y costs .2 M $
X:Y would be 1 M$ : .2M $ ====> 5:1 (ans)
Assumption X litres of milk cost M$
Addition of Y litres of water. What the question is asking is X:Y.
X costs m$
X+Y costs 1.2M $
Y costs .2 M $
X:Y would be 1 M$ : .2M $ ====> 5:1 (ans)
25 Oct 2020, 07:51
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Bunuel
Since we are asked about the ratio, we can take any volume of the milk/water mixture.
Just think what would make the cost and selling price equal per unit of mixture sold.
As 20% converts to 1/5, we can take 5 litre of milk and add 1 litre of water to make the milk/water mixture of volume 6 litre.
Now, selling 6 at the same per unit price as it costed we would have
CP = 5 i.e. 1 per litre of milk
SP = 6 where per litre price is still 1 per litre of mixture.
So, profit = 1 i.e. 20% of 5
Hence ratio, milk:water = 5:1
Answer B.
