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WAEC 2019 · Paper 1 · Q29

A rectangular board has a length of 15 cm15\text{ cm} and width x cmx\text{ cm}. If its sides are doubled, find its new area.

Worked solution (try it first)
  1. Doubling the sides makes the board 3030 cm by 2x2x cm.
  2. The new area is 30×2x=60x cm230 \times 2x = 60x\text{ cm}^2, option A.

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