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3. A rectangular prism with integer side lengths has two faces with areas 15 and 21. What could its volume be? 

 Apr 10, 2020
 #1
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Notice that 3*5=15 and 3*7=21, thus the side lengths are 3 units, 5 units, and 7 units. The total volume is therefore 3*5*7=105 square units.

 Apr 11, 2020

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