MathematicsVariationWAEC
z varies jointly as x and y, and z = 24 when x = 2 and y = 3. Find z when x = 4 and y = 5.
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Answer: A. 80
z = kxy with k = 24/6 = 4, so z = 4 × 4 × 5 = 80.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.