A solution of 38% wine is mixed with a solution of 28% wine in the ratio of 2 : 3. In what ratio should this resulting mixture be mixed with a 54% wine solution to get a final solution containing 42% wine?

A shopkeeper mixes two types of rice in the ratio 5 : 3, where one type costs ₹75 per kg and the other costs ₹85 per kg. Find the average price per kg of the mixture.

In what ratio (cheaper to dearer) should a grocer mix two varieties of pulses costing ₹18 and ₹22 per kg, respectively, to obtain a mixture worth ₹19.50 per kg?