CDS Model Paper 5 Mathematics

Let x and y be two containers.
Ratio of milk to water in container x=5:1
and ratio of milk to water in container y=7:2
It is given that quantity of milk should be 80% in new mixture. This means that quantity of water will be 20% that quantity of water will be 20%
∴ Ratio of milk to water in new mixture =80:20=4:1.
∴

5

6

x+

7

9

y:

1

6

x+

2y

9

=4:1
⇒

5x 6 + 7y 9

x6+ 2y 9

=

4

1

⇒

15x+14y

3x+4y

=

4

1

⇒15x+14y=12x+16y
⇒ 3x=2y⇒x:y=2:3