The daddy cube and a baby cube (who is not independent yet) - 7/4/2025

A cube has edge length 2. Suppose that we glue a cube of edge length 1 on top of the big cube so that one of its faces rests entirely on the top face of the larger cube. The percent increase in the surface area (sides, top, and bottom) from the original cube to the new solid formed is closest to

  • A: 10
  • B: 25
  • C: 17
  • D: 21
  • E: 25
0 voters

Btw, there’s 2 25s

Thanks. That’s a typo. Option B should be 15 instead.