WAEC Mathematics 2019 Objective — Question 30

Question 30 of 145 from the West African Examinations Council (WAEC) Mathematics 2019 Objective paper, with the correct answer and a full explanation.

30. A rectangular board has length 15cm and width x cm. If its sides are doubled, find its new area.

A. 60xcm²Correct
B. 45xcm²
C. 30xcm²
D. 15xcm²

Explanation

When the sides are doubled, length l=30cm, width w=2x. New area = l×w = 30×2x = 60x cm².

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