A grocer has two types of tea priced at Rs. 60 per kg and Rs. 65 per kg. In what proportion should he blend these teas if he wants to sell the mixture at Rs. 68.20 per kg and achieve a 10% profit?

Explanation

The grocer aims for a 10% gain by selling the mixture at Rs. 68.20 per kg. First, calculate the cost price of the mixture by dividing the selling price by 1.10, which gives Rs. 62 per kg. Using the rule of alligation between Rs. 60 and Rs. 65, the ratio is (65 - 62) : (62 - 60) = 3 : 2. Therefore, the correct mixing ratio is 3:2.