Question

A mixture of 90 liters contains milk and water in the ratio 2: 1. if this ratio is to be changed to 1: 3, then quantity of water that should be further added is:

Answer 1

milk : water = 2 : 1

mixture is 90 liters

so dividing it in ratio 2 : 1

we get

milk : water = 60 : 30

now milk remains as it is as we adding the water only

the mixture becomes

milk : water = 1 : 3

but , now milk is 60 liter

milk : water = 1 : 3 = 60 : 60×3

60 : 180 liter

initially water was 30 liter

so 180 - 30 = 150 liter water further added