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Post-UTME Mathematics 2010 Objective — Question 4

Question 4 of 10 from the Post-UTME Screening (Post-UTME) Mathematics 2010 Objective paper, with the correct answer and a full explanation.

If v varies directly as the square of x and inversely as y, and if v=18 when x=3 and y=4, find v when x=5 and y=2.

A. 101
B. 100Correct
C. 98
D. 90

Explanation

v=kx^2/y. 18=k(9)/4, k=8. New v=8(25)/2=100.

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