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WAEC Mathematics 2019 Objective — Question 27

Question 27 of 145 from the West African Examinations Council (WAEC) Mathematics 2019 Objective paper, with the correct answer and a full explanation.

27. Make b the subject of the relation lb = ½(a+b)h.

A. b = ah/(2l-h)Correct
B. b = 2l-h/al
C. b = ah/(2l-h)
D. b = al/(2-h)

Explanation

lb = ½(a+b)h ⇒ 2lb=(a+b)h=ah+bh ⇒ 2lb−bh=ah ⇒ b(2l−h)=ah ⇒ b = ah/(2l−h).

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