Question

how many litre of water is to be mixed in 12 litre of milk costing rs.10 per litre, so that it can be sold at rs.8 per litre?​

Answer 1

12*10=120

15*8=120

therefore 3litre water should be added

Answer 2

Step-by-step explanation:

12 litre of milk costing 10 = 12×10=120

let x litre of water be added =8x

8x=120

x=15

hence water is added=15-12=3 litre.