A rectangular prism is completely packed with 90 cubes of edge length fraction 1 over 2 inch, without any gap or overlap. Which of the following describes the volume of this rectangular prism?
11 unit cubes and 1 smaller cube of volume fraction 1 over 8 cubic inch
22 unit cubes and 4 smaller cubes of volume fraction 1 over 8 cubic inch each
11 unit cubes and 2 smaller cubes of volume fraction 1 over 8 cubic inch each
22 unit cubes and 2 smaller cubes of volume fraction 1 over 8 cubic inch each
Could someone teach me the steps please? I reviewed the lesson, I still don't understand

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Hint: volume of each cube = 1/2 * 1/2 * 1/2

oh you were given that anyway!

so that would be 1/6

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