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Question

In what ratio is water to be mixed with milk at Rs. 9.60 per litre to make the price of the mixture Rs. 9 per litre?



A

15:2

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B

15:4

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C

15:1

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D

15:3

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Solution

The correct option is B

15:1


Assume that cost of water is 0

Let quantity of water be y litre.
and quantity of milk be x litre.
Quantity of mixture will be (x+y) litre and the given cost of the mixture Rs. 9 per litre.
Now, 9.6x=9(x+y)
9.6x=9x+9y
9.6x-9x=9y
0.6x=9y
xy=90.6=906=15


Quantitative Aptitude

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