Direct variation - Jamb Mathematics Past Questions and Answers

Question 6:

• JAMB 2014

y varies directly as w². When y = 8, w = 2. Find y when w = 3

A. 18
B. 12
C. 9
D. 6

Question 7:

• JAMB 2014

P varies directly as Q and inversely as R. When Q = 36 and R = 16, P = 27. Find the relation between P, Q and R.

A. \(P = \frac{Q}{12R}\)
B. \(P = \frac{12Q}{R}\)
C. \(P = 12QR\)
D. \(P = \frac{12}{QR}\)

Question 8:

• JAMB 1986

If x varies directly as y³ and x = 2 when y = 1, find x when y = 5

A. 2
B. 10
C. 125
D. 250

Question 9:

• JAMB 2002

If x varies directly as √n and x = 9 when n = 9, find x when n = (17/9)

A. 4
B. 27
C. √3
D. √17

Question 10:

• JAMB 2003

x varies directly as the product of u and v and inversely as their sum. If x = 3 when u = 3 and v = 1, what is the value of x if u = 3 and v = 3?

A. 3
B. 4
C. 6
D. 9