Quantitative Aptitude :: Partnership - Discussion

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Explanation:
Lets assume the total profit = Rs. T
so Y part = 2*T/7 and
X part = T - 2*T/7 = 5*T/7
X, Y ratio
=> X : Y = 5*T/7 : 2*T/7 = 5 : 2
Y invested Rs.P

so (16000 * 8) / (P * 4) = 5/2
=> P = (16000 * 8 * 2) /(5 * 4)
=> P = Rs. 12800