向众位大虾请教:
白皮书上的一道数学题:
The surface area of a square tabletop was changed so that one of the dimensions was reduced by 1 inch and the other dimension was increased by 2 inches.What was the surface area before these changes were made?
1) After the changes were made, the surface area was 70 square inches.
2) There was a 25 percent increase in one of the dimensions.