A welder received an order to make a 1 million liter cube-shaped tank. If he has only 3x2 meter sheets of metal that can be cut, how many metal sheets will be required for this order? (1 cubic meter = 1,000 liters)
Choose the correct choice from the following choices.
A) 100  B) 90  C) 82  D) 78  E) 75
The question say:A welder received an order to make a 1 million liter cube-shaped tank. (1 cubic meter = 1,000 liters)   In other words, the tank is going to have a volume of 1000 cubic meters. That would equal 1 million liters.   A cube with a volume of 1000 cubic meters must be (10 meters) x (10 meters) x (10 meters).   The question doesn't specify whether this tank should have a closed top or an open top. (The real GMAT is good about specifying things like that.) Here, we are going to assume a closed top, only because if the top is open, we don't use enough metal --- we get an answer smaller than any of the answer choices. A closed-top cube, a full cube, has 6 sides, each of which is (10 meters) x (10 meters). That's a total surface area of 600 sq m.   The question tells us:he has only 3x2 meter sheets of metal that can be cut.   Each sheet has an area of 6 sq m. How many of these need to fill up 600 sq m?  600/6= 
<gadget id="calculator"> 600/6</gadget>
<output>100</output>
100. He needs 100 sheets.   100nswer=100
<result>A</result>
A welder received an order to make a 1 million liter cube-shaped tank. If he has only 3x2 meter sheets of metal that can be cut, how many metal sheets will be required for this order? (1 cubic meter = 1,000 liters)