Question

A mixture of certain quantity of milk with 20 litres of water of worth rs.10 per litre. if pure milk is of worth rs.15 per litre, how much milk is there in the mixture?

Answer 1

10÷20=0.5 and 15÷20=0.75
0.5×0.75=0.375

Answer 2

Answer:

The quantity of milk is 40 litre.

Step-by-step explanation:

Given : A mixture of certain quantity of milk with 20 litres of water of worth Rs.10 per litre. If pure milk is of worth Rs.15 per litre.

To find : How much milk is there in the mixture?

Solution :

Let the quantity of milk be 'x' litre.

Cost of 1 litre milk = Rs. 15

According to question,

$(x+20)\times 10=x\times 15+20\times 0$ (as cost of water is 0)

Solving the equation,

$10x+200=15x$

$15x-10x=200$

$5x=200$

$x=\frac{200}{5}$

$x=40$

Therefore, The quantity of milk is 40 litre.