To find the average price of the mixture of two different types of milk, we can use the formula for the weighted average of the prices. The weighted average formula is:

\(\text{Average Price} = \frac{(P_1 \times Q_1) + (P_2 \times Q_2)}{Q_1 + Q_2}\)

• \(P_1\) is the price per litre of the first type of milk, which is ₹25.
• \(Q_1\) is the quantity of the first type of milk, which is 42 litres.
• \(P_2\) is the price per litre of the second type of milk, which is ₹40.
• \(Q_2\) is the quantity of the second type of milk, which is 28 litres.

Now, substituting the values into the formula:

\(\text{Average Price} = \frac{(25 \times 42) + (40 \times 28)}{42 + 28}\)

Calculate the individual products:

• \(25 \times 42 = 1050\)
• \(40 \times 28 = 1120\)

Add these products:

\(1050 + 1120 = 2170\)

Add the quantities:

\(42 + 28 = 70\)

Now, divide the total cost by the total quantity to find the average price:

\(\text{Average Price} = \frac{2170}{70} = 31\)

Thus, the average price of the mixture is ₹31.