Multiple choice

The perimeter of a rectangular whiteboard is 14 m and its width is a m. What would be the perimeter of a new whiteboard whose length is 2 m more than the length of the older whiteboard?

  1. 18 m

  2. 9 m

  3. 22 m

  4. 10 m

  5. 16 m
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A Correct answer
Explanation

Let the length of the whiteboard be l m and width of the whiteboard be a m. Perimeter of the whiteboard = 14 m 2(l + w) = 14 Now, the length of the new whiteboard is (2 + l) m and width of the whiteboard is a m. Hence, the perimeter of the new whiteboard = 2(L + w) = 2(2m + l m + w m)                                                                                 = 4m + 2(l + w)                                                                                 = 4m + 14m = 18 m

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