Jamb Mathematics Past Questions and Answers

Question 621:

• JAMB 1980

If \(\theta\) = \(\frac{3}{2}\) and \(\theta\) is less than 90^o, calculate tan \(\frac{(90 - \theta)}{cos^2\theta}\)

A. \(\frac{1}{2}\)
B. \(\frac{4}{\sqrt{3}}\)
C. \(\sqrt{3}\)
D. 4\(\sqrt{3}\)

Question 622:

• JAMB 1981

Suppose x varies inversely as y, y varies directly as the square of t and x = 1, when t = 3. Find x when t = \(\frac{1}{3}\).

A. 81
B. 27
C. \(\frac{1}{9}\)
D. \(\frac{1}{27}\)
E. \(\frac{1}{81}\)

Question 623:

• JAMB 1981

Suppose x varies inversely as y, y varies directly as the square of t and x = 1, when t = 3. Find x when t = \(\frac{1}{3}\).

A. 81
B. 27
C. \(\frac{1}{9}\)
D. \(\frac{1}{27}\)
E. \(\frac{1}{81}\)

Question 624:

• JAMB 1981

If sine x equals cosine x, what is x in radians?

A. \(\frac{\pi}{2}\)
B. \(\frac{\pi}{3}\)
C. \(\frac{\pi}{4}\)
D. \(\frac{\pi}{6}\)
E. \(\frac{\pi}{12}\)

Question 625:

• JAMB 1981

The ratio of the price of a loaf of bread to the price of a packet of sugar in 1975 was r : t. In 1980, the price of a loaf went up by 25% and that of a packet of sugar went up by 10%. Their new ratio is now

A. 40r:50t
B. 44r : 50t
C. 50r : 44t
D. 44r:55t
E. 55r:44t