Book Maths Puzzle Numerical Ability

A borrowed some money from B at 12% p.a simple Interest and another sum money to the borrowed sum and lent it to C for the same period at 14% p.a rate of interest. If A gains Rs. 93.90 in the whole transaction, how much money did he add from his side?

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Book Other Question

A milkman makes 20% profit by selling milk mixed with water at Rs. 9 per litre. If the cost price of 1 litre pure milk is Rs. 10, then the ratio of milk and water in the said mixture is logy1369y = 3