Jamb Mathematics Past Questions and Answers

Question 516:

• JAMB 1978

The vectors a and b are given in terms of two perpendicular units vectors i and j on a plane by a = 2i - 3j, b = -i + 2j. Find the magnitude of the vector a + 3b

A. 2
B. 4
C. \(\sqrt{10}\)
D. 35
E. 2.2

Question 517:

• JAMB 1978

Add the same number to the numerator and denominator of \(\frac{3}{18}\). If the resulting fraction is \(\frac{1}{2}\), then the number added is

A. 13
B. 14
C. 15
D. 12
E. 11

Question 518:

• JAMB 1978

The smallest number such that when it is divided by 8 has a remainder of 6 and when it is divided by 9, has a remainder of 7 is

A. 387
B. 493
C. 502
D. 441
E. 634

Question 519:

• JAMB 1978

In the figure, DE//BC: DB//FE: DE = 2cm, FC = 3cm, AE = 4cm. Determine the length of EC.

A. 4cm
B. 6cm
C. 3cm
D. 2cm
E. 1cm

Question 520:

• JAMB 1978

In the figure, AB is parallel to CD then x + y + z is

A. 185^o
B. 200^o
C. 270^o
D. 360^o
E. 195^o