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Heres how to solve it:

choose the box dimensions:
  • The tube is 10 in long and has a 6 in diameter, so it’s a cylinder of height 10 and radius 3.
  • To fit it in a rectangular box with the least material, you lay it on its side so that the box’s base just contains a 6 in × 6 in square (the tightest possible rectangle that will accommodate a circle of diameter 6).
  • Thus the optimal box is 6 in by 6 in by 10 in.

Box volume = 6 × 6 × 10 = 360 in3.

Compute the cylinder’s volume:
  • Cylinder volume = π·r2·h = π·(32)·10 = 90 π.
  • approximate (π≈3), that is 90·3 = 270 in3.

Find the unused space:
  • Unused = box volume – cylinder volume
  • 360 – 270 = 90 in3.

sayan640
GMATinsight KarishmaB chetan2u Would you like to discuss this question ?­