Discussion
To gain profit, a milkman adds 1.5 litre of water to a certain amount of milk. He sells the adulterated milk at Rs.28 per litre and pure milk costs Rs.36 per litre. Find the amount of milk.
Answer: A
The water is free, so "no loss" means the revenue from the whole adulterated quantity just covers the cost of the pure milk.
\[ 28(m + 1.5) = 36m \]
\[ 28m + 42 = 36m \quad\Longrightarrow\quad 8m = 42 \]
\[ m = 5.25 \text{ litres} \]
Selling at a price below cost is profitable only because the 1.5 L of water is sold as though it were milk.
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