The surface area of a rectangular field was changed so that the length of one of the dimensions was reduced by 10 feet

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The surface area of a rectangular field was changed so that the length of one of the dimensions was reduced by 10 feet and the length of the other dimension was increased by 20 feet. What was the surface area before these changes were made?

1) After the changes were made, the surface area was 2,500 square feet
2) The length and width of the field were equal after the changes were made

OA C
Source: — Data Sufficiency |