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September 20, 2014

September 20, 2014

Posted by **Shadow** on Thursday, September 1, 2011 at 8:07pm.

The sides of one cube are twice as long as the sides of a second cube. What is the side length of each cube if the total volume of the cubes is 72 cm^3?

Would it be, 3x+6x=72? Thanks

- Shadow -
**bobpursley**, Thursday, September 1, 2011 at 8:12pmNo. It wouldn't be that.

volumes of cubes is V=s^3 where s is side length.

72= s^3+ (2s)^3= s^3+8s^3

72=9s^3

and you find s, the side length of the smaller cube, and 2s is the side length of the larger cube.

- Shadow -
**Shadow**, Thursday, September 1, 2011 at 8:17pmI came up with 8=s^3, how would I solve this? Thanks

- Shadow -
**bobpursley**, Thursday, September 1, 2011 at 8:17pmTake the cube root of each side.

- Shadow -
**Shadow**, Thursday, September 1, 2011 at 8:20pmThanks for your help!

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