Simultaneous equations - Jamb Mathematics Past Questions and Answers

Question 11:

• JAMB 1979

12 men complete a job in 9 days. How many men working t the same rate would be required to complete the job in 6 days?

A. 24
B. 18
C. 12
D. 9
E. 8

Question 12:

• JAMB 1979

A father is now three times as old as his son. Twelve years ago he was six times as old as his son. How old are the son and the father?

A. 20 and 45
B. 100 and 150
C. 45 and 65
D. 35 and 75
E. 20 and 60

Question 13:

• JAMB 1980

Find the solution of the equation x + 2\(\sqrt{x - 8}\) = 0

A. (4, 16)
B. (2, 4)
C. (4, 1)
D. (1, 16)
E. (16, 16)

Question 14:

• JAMB 1980

Solve the system of equation 2^{x + y} = 32, 3^{3y - x} = 27

A. (3, 2)
B. (-3, 2)
C. (3, -2)
D. (-3, -2)
E. (2, 2)

Question 15:

• JAMB 1981

Find a two-digit number such that three times the tens digit is 2 less than twice the units digit and twice the number is 20 greater than the number obtained by reversing the digits

A. 24
B. 42
C. 74
D. 47
E. 72