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