# Allegation GMAT Question of the Day

A mixture of milk and water measures 60 gallons. It contains 20% water. How many gallons of water should be added to it so that water may be 25%?

a) 6 gallons
b) 4 gallons
c) 8 gallons
d) 10 gallons
e) 5 gallons

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1. steve says:

b

2. Erlan says:

Looks like nobody knows the answer.

4. Aliva says:

I find it quite simple..although i dont exactly know that m correct or not!!!
60 x

20 100
\ /

25
/ \
75 5
so,15:1=60:x
so, x=4 gallons.
plz guide if i’m wrong anywhere

5. aryan says:

B

6. Ram says:

I am getting 4 Gallons …
Soln :-
initial quantity of water = 20/100(60) = 12 gallons
New quantity of water = (12 +x) gallons
Total quantity of mixture will become = (60+x) gallons

New quantity of water = 25/100(60+x)

==> 25/100(60+x) = 12+x
Solving for x , we get 4 gallons ..

7. Well done Aliva & Ram !
Till now we solved the question with two approaches. One from Allegation & other from equation.

Can we have third punter approach with mental calculation as well ?

8. Pankaj says:

B for me…

9. keerthi says:

20%(60) = 12 gallons of water

(60+x gallons) mixture —-100%
(12+x gallons) water ——-25%

(12+x) 100 = (60+x) 25
x = 4 gallons of water to be added

Option B

10. Aliva says:

Thanx Gmat Team

11. Pedro U. says:

B. 48/75% – 60

12. Subhal says:

20% of 60 is 12
60-12=48
this 48 is 75%
therefore 100% is 48*(4/3)=64
ans is 64-60=4
B)