Question 9

In what ratio salt costing Rs.13/kg mixed with another salt costing Rs.7/ kg to get a mixture costing Rs.9/kg?

Solution

Let quantity of Rs. 13/kg and Rs. 7/kg salt mixed be $$x$$ and $$y$$ kg respectively.

According to ques,

=> $$13x+7y=9(x+y)$$

=> $$13x+7y=9x+9y$$

=> $$13x-9x=9y-7y$$

=> $$4x=2y$$

=> $$\frac{x}{y}=\frac{2}{4}=\frac{1}{2}$$

$$\therefore$$ Required ratio = $$1:2$$

=> Ans - (D)

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