The concentration of acid in two solution A and B is 19 percent and 9 percent respectively.In what ratio solution A and B should be mixed to get a solution having 17 percent acid?

Using the rule of alligation on the acid percentages, we place the higher value 19, the lower value 9, and the mean value 17 in the standard cross pattern. The ratio of the quantity of B to A is calculated by subtracting the mean from the higher value, resulting in 19 minus 17 equals 2. The ratio of the quantity of A to B is calculated by subtracting the lower value from the mean value, resulting in 17 minus 9 equals 8. This gives a required mixing ratio of A to B of 8 to 2, which simplifies to 4 to 1.

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