Inverse variation - Jamb Mathematics Past Questions and Answers

Question 6:

• JAMB 1988

If x varies inversely as the cube root of y and x = 1 when y = 8, find y when x = 3

A. \(\frac{1}{3}\)
B. \(\frac{2}{3}\)
C. \(\frac{8}{27}\)
D. \(\frac{4}{9}\)

Question 7:

• JAMB 1991

If w varies inversely as \(\frac{ur}{u + r}\) and is equal to 8 when
u = 2 and r = 6, find a relationship between u, v, w.

A. Urw = 16(u + v)
B. 16ur = 3w(u + v)
C. Urw = 12(u + v)
D. 12urw = u + v

Question 8:

• JAMB 2003

The length a person can jump is inversely proportional to his weight. If a 20 kg person can jump 1.5 m, find the constant of proportionality

A. 60
B. 30
C. 20
D. 15

Question 9:

• JAMB 2004

y is inversely proportional to x and y = 4 when x = 1/2. Find x when y = 10.

A. 2
B. 10
C. 1/5
D. 1/10

Question 10:

• JAMB 2005

The time taken to do a piece of work is inversely proportional to the number of men employed. If it takes 30 men to do a piece of work in 6 days, how many men are required to do the work in 4 days?

A. 20
B. 35
C. 45
D. 60