UPSC Civil Services 2015 Prelims General Studies Paper II

Let the capacity of each of the equal glass = x litre Each glass containing x∕3l and x∕4l of milk.
The quantities of milk in first and the second glasses were

x

3

and

x

4

respectively
=(

x

3

+

x

4

)=

4x+3x

12

=

7x

12

l
So, the quantities of water in the first and the second glasses were
=(x−

x

3

)l and (x−

x

4

)l
=

2x

3

+

3x

4

=

8x+9x

12

=

17x

12

l
Ratio of milk and water =

7x

12

:

17x

12

=

7

17

or 7: 17