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?  Pick:
A) 36 liters
B) 40 liters
C) 45 liters
D) 54 liters
E) 60 liters
A big container is 30% full with water and after 18 liters of water is added, the container becomes 75% full. Hence these 18 liters account for 45% of the container, which means that the capacity of it is  18/0.45= 
<gadget id="calculator"> 18/0.45</gadget>
<output>40</output>
40 liters.   OR: if the capacity of the container is x liters then: 0.3x+18=0.75x --&gt; x=40 liters.   Answer: 40 liters.
<result>B</result>
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?