A big container is 30% full with water. If 36 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) 36 liters B) 40 liters C) 45 liters D) 54 liters E) 80 liters
A big container is 30% full with water and after 36 liters of water is added, the container becomes 75% full. Hence these 36 liters account for 45% of the container, which means that the capacity of it is  36/0.45= 
<gadget id="calculator"> 36/0.45</gadget>
<output>80</output>
80 liters.   OR: if the capacity of the container is x liters then: 0.3x+36=0.75x --&gt; x=80 liters.   Answer: 80 liters.
<result>E</result>
A big container is 30% full with water. If 36 liters of water is added, the container becomes 3/4 full. What is the capacity of the big container?