Question

A milkman bought 15 litres of milk and mixed 3 litres of water in it. If the price per litre of the mixture becomes Rs 22, what is cost price of the milk per litre?

• A. Rs. 28.00
• B. Rs. 26.40
• C. Rs. 24.00
• D. Rs. 22.00
• E. None of these

Answer 1

The correct option is B Rs. 26.40

Let cost price of milk be Rs. x per kg.
Price of 15kg of milk = Rs. 15x
Now, mix 3kg of water, therefore quantity of mixture$=(15+3)kg=18kg$
So, the price of the mixture is Rs. 22 per kg.
$15x=22\times 18x=\frac{22\times 18}{15}=\frac{132}{5}=26.40$