MathematicsVariationJAMB
V varies jointly as r² and h. V = 40 when r = 2 and h = 5. Find V when r = 3 and h = 4.
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Answer: A. 72
V = kr²h: 40 = 20k gives k = 2; V = 2 × 9 × 4 = 72.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.