nafishasan wrote:A big container is 30% full with water. If 18 liters of water is added, the container becomes 3/4 full. What is the capacity of the big container?
A) 36 liters
B) 40 liters
C) 45 liters
D) 54 liters
E) 60 liters
We can plug in the answer choices, which represent the capacity of the container.
The correct answer must be a multiple of 4, since the container is 3/4 full after the 18 liters of water is added.
Eliminate C and D.
The added water raises the fullness level by 45% (from 30% to 75%.)
Thus, 18 liters is just a bit less than half the capacity of the container.
Only
B is viable:
.45(40) = 18.
The correct answer is
B.
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