AFCAT Model Paper 8

Given:
The initial and the final ratio of milk and water in a given mixture are 4∶9 and 1∶3. 20 L of water is added to this mixture.
Calculation:
Let the initial quantity of milk and water in the mixture be 4x, 9x
After adding 20 L of water the ratio becomes 1:3
⇒

(4x)

(9x+20)

=

1

3

⇒ 12x = 9x + 20
⇒ 3x = 20, x=

20

3

Now the initial quantity of water in the mixture =9×(

20

3

)=60L
∴ Initial quantity of water in the mixture is 60L.