Direct variation - Jamb Mathematics Past Questions and Answers

Question 11:

• JAMB 2006

If p varies inversely as the cube of q and q varies directly as the square of r, what is the relationship between p and r?

A. P varies directly as r³
B. P varies inversely as r⁶
C. P varies inversely as ⁶√P
D. P varies directly as r⁶

Question 12:

• JAMB 2007

W ∝ L² and W = 6 when L = 4. If L = √17 find W

A. 6⁷/₈
B. 6⁵/₈
C. 6³/₈
D. 6¹/₈

Question 13:

• JAMB 2008

If x - 3 is directly proportional to the square of y and x = 5 when y =2, find x when y = 6.

A. 30
B. 21
C. 16
D. 12

Question 14:

• JAMB 2009

W is directly proportional to U. If W = 5 when U = 3, find when W = 2/7

A. ⁶/₃₅
B. ¹⁰/₂₁
C. ²¹/₁₀
D. ³⁵/₆

Question 15:

• JAMB 2010

If y varies directly as the square root of x and y = 3 when x = 16. Calculate y when x = 64

A. 12
B. 6
C. 3
D. 5