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The diagram below shows the measurements of two identical rectangular prisms joined together. Austin says the combined volume of the prisms is 225 cubic meters. Explain Austin’s error and give the correct volume.

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rawlb1

Answer:

450 cubic meters

Step-by-step explanation:

  1. ( 15 X 5 X 3) + ( 15 x 5 x 3)
  2. 225 + 225
  3. 450 cubic meters

Austin didn't add the 2 prisms, he multiplied the 1st prism and kept it as the answer.  

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