Question
A and B started a retail store with initial investments
in the ratio 9:10 and their annual profits were in the ratio 3:4. If A invested the money for 5 months, then for how many months did B invest his money?ÂSolution
Suppose A invested Rs. 9x for 5 months and B invested 10x for y months then, ⇒  (9x × 5)/(10x × y) = 3/4 ⇒  y = (45x × 4)/(10x × 3) ⇒  y = 180x/30x ⇒  y = 6
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