Symbiosis National Aptitude Test SNAP 2019 Paper

After replacing 6 litres of milk by water, the container contains (x – 6) litres milk and 6 litres water.
Ratio of Milk : Water = (x – 6) : 6
Again, Mohan replaced 6 litres of mixture by 6 litres of water.
So, quantity of milk remains
= (x - 6) - 6 ×

(x+6)

x

=

(x+6)2

x

Quantity of water = 6 - 6 ×

6

x

+6
=

12

x

(x−3)
ATQ,

(x−6)2

x

:

12

x

(x−3) :: 9 : 16

(x−6)2

12(x−3)

=

9

16

4(x–6)2 = 27(x – 3)
4x2 – 75x + 225 = 0
(4x – 15)(x – 15) = 0
∴ x = 15 litres.