A big container is 30% full with water. If 9 liters of water is added, the container becomes 3/4 full. What is the capacity of the big container?
Choose the most appropriate option:
A) 20 liters B) 40 liters C) 45 liters D) 54 liters E) 60 liters
A big container is 30% full with water and after 9 liters of water is added, the container becomes 75% full. Hence these 9 liters account for 45% of the container, which means that the capacity of it is  9/0.45= 
<gadget id="calculator"> 9/0.45</gadget>
<output>20</output>
20 liters.   OR: if the capacity of the container is x liters then: 0.3x+9=0.75x --&gt; x=20 liters.   20 litersnswer: 20 liters.
<result>A</result>
A big container is 30% full with water. If 9 liters of water is added, the container becomes 3/4 full. What is the capacity of the big container?