Direct variation - Jamb Mathematics Past Questions and Answers

Question 1:

• JAMB 1979

The mean of the numbers 1.2, 1.0, 0.9, 1.4, 0.8, 0.8, 1.2 and 1.1 is

A. 1.5
B. 0.8
C. 1.0
D. 1.02
E. 1.05

Question 2:

• JAMB 1979

x is directly proportional to y and inversely proportional to z. If x = 9 when y = 24 and z = 8, what is the value of x when y = 5 and z = 6?

A. \(\frac{5}{6}\)
B. 11
C. 3\(\frac{3}{5}\)
D. 2\(\frac{1}{2}\)
E. 1\(\frac{1}{5}\)

Question 3:

• JAMB 2019

If M varies directly as N and inversely as the root of P. Given that M = 3, N = 5 and P = 25. Find the value of P when M = 2 and N = 6.

A. 36
B. 63
C. 47
D. 81

Question 4:

• JAMB 2017

If temperature t is directly proportional to heat h, and when t = 20oC, h = 50 J, find t when h = 60J

A. 24^oC
B. 20^oC
C. 34^oC
D. 30^oC

Question 5:

• JAMB 2017

If temperature t is directly proportional to heat h, and when t = 20^oC, h = 50 J, find t when h = 60J

A. 24^oC
B. 20^oC
C. 34^oC
D. 30^oC