T.S.Jain Solutions for Exercise 1: EXERCISE 15

A trader bought $50$ kg of wheat of $Rs. 7$ per kg and $20 \mathrm{kg}$.at  $Rs. 8$per kg. He mixed the two and sold the mixture at $Rs. 10$per kg. What is his profit?

Alok bought $30 \mathrm{kg}$ of rice at $Rs 8.50$ per kg and $20 \mathrm{kg}$ of rice at $Rs 8$ per kg . If he has to make a $20\%$ profit, at approximately what rate per kg should he sell the rice?

A trader bought $20$ kg of wheat at $Rs. 6.50$ per kg and $30 kg$ of wheat at $Rs. 7$ per kg.

He sold the mixture at a profit of $Rs. 60$. At what price did he sell per kg of the mixture of wheat?

How much water should be added to $175$litre of milk at $Rs. 8.00$ per litre so as to have a mixture worth $Rs. 7.00$per litre?

A man buys milk at a certain price and after mixing it with water sells it again at the same price. How many $ml$ of water he mixes in a litre of milk if he makes a profit of $20\%$?

A mixture of $40$ litres of milk and water contains $10\%$ of water. How much water must be added to make the water $20\%$ of the resulting mixture?

Pure ghee costs $₹100$ per kg. After adulterating it with vegetable oil costing $50$ per kg, a shopkeeper sells the mixture at $₹96$ per kg, thereby making a profit of $20\%$. In what ratio does he mix the two? 

By mixing two qualities of pulses in the ratio $2 : 3$ and selling the mixture at the rate of $Rs. 22$ per $kg$, a shopkeeper makes a profit of $10\%$. If the cost of $kg$ of the larger quantity is: