Inverse variation - Jamb Mathematics Past Questions and Answers

Question 11:

• JAMB 2008

If p varies inversely as the square of q and p=8 when q=4, find q when p =32

A. \(\pm\)16
B. \(\pm\)8
C. \(\pm\)4
D. \(\pm\)2

Question 12:

• JAMB 2010

If x is inversely proportional to y and x = 2\(\frac{1}{2}\) when y = 2, find x if y = 4

A. 4
B. 5
C. 1\(\frac{1}{4}\)
D. 2\(\frac{1}{4}\)

Question 13:

• JAMB 2011

T varies inversely as the cube of R. When R = 3, T = \(\frac{2}{81}\), find T when R = 2

A. \(\frac{1}{18}\)
B. \(\frac{1}{12}\)
C. \(\frac{1}{24}\)
D. \(\frac{1}{6}\)

Question 14:

• JAMB 2012

U is inversely proportional to the cube of V and U = 81 when V = 2. Find U when V = 3

A. 24
B. 27
C. 32
D. 36

Question 15:

• JAMB 2012

The binary operation on the set of real numbers is defined by m*n = \(\frac{mn}{2}\) for all m, n \(\in\) R. If the identity element is 2, find the inverse of -5

A. \(-\frac{4}{5}\)
B. \(-\frac{2}{5}\)
C. 4
D. 5