Jamb Mathematics 2019 Past Questions and Answers

Question 46:

• JAMB 2019

In the diagram above, O is the centre of the circle ABC, < ABO = 26° and < BOC = 130°. Calculate < AOC.

A. 26°
B. 13°
C. 80°
D. 102°

Question 47:

• JAMB 2019

Each of the interior angles of a regular polygon is 140°. Calculate the sum of all the interior angles of the polygon.

A. 1080°
B. 1260°
C. 2160°
D. 1800°

Question 48:

• JAMB 2019

A man bought a car newly for #1,250,000. He had a crash with the car and later sold it at the rate of #1,085,000. What is the percentage gain or loss of the man?

A. 43.7% loss
B. 13.2% gain
C. 13.2% loss
D. 43.7% gain

Question 49:

• JAMB 2019

If the volume of a frustrum is given as \(V = \frac{\pi h}{3} (R^2 + Rr + r^2)\), find \(\frac{\mathrm d V}{\mathrm d R}\).

A. \(\frac{\pi h}{3} (2R + r)\)
B. \(2R + r + \frac{\pi h}{3}\)
C. \(\frac{\pi h}{3} (2R^2 + r + 2r)\)
D. \(\frac{2R^2}{3} \pi h\)

Question 50:

• JAMB 2019

Express \((0.0439 \div 3.62)\) as a fraction.

A. \(\frac{21}{100}\)
B. \(\frac{21}{1000}\)
C. \(\frac{12}{1000}\)
D. \(\frac{12}{100}\)