MathematicsVariationJAMB
z varies directly as x and inversely as y. If z = 6 when x = 3 and y = 2, find z when x = 4 and y = 8.
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Answer: C. 2
z = kx/y: 6 = 3k/2 gives k = 4; z = 4 × 4/8 = 2.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.