Jamb Mathematics 1980 Past Questions and Answers

Question 21:

• JAMB 1980

A set of data contains a total of 130 items which are divided into six groups for display on a pie chart. If one group contains 26 items, then the sector representing this group on the pie chart contains an angle x^o at the centre of the circle where x is

A. 36^o
B. 60^o
C. 70^o
D. 72^o
E. 75^o

Question 22:

• JAMB 1980

In triangle FGB, < G = 90^o, < H = 60^o, while in triangle XYZ, < X = 60^o and < Y = 30^o. Form XYZ write down the ratio equal to \(\frac{FG}{FH}\)

A. \(\frac{YX}{ZX}\)
B. \(\frac{YX}{YZ}\)
C. \(\frac{ZX}{YZ}\)
D. \(\frac{YZ}{XY}\)

Question 23:

• JAMB 1980

A pentagon has four of its angles equal. If the size of the fifth angle is 60^o, Find the size of each of the four equal angles.

A. 60^o
B. 108^o
C. 120^o
D. 150^o
E. None of the above

Question 24:

• JAMB 1980

Find the product of (2\(\sqrt{y - 3y}\)) and (3y = 2y)

A. 4y = y²
B. 4y + 9y²
C. 4y - 9y²
D. -4y - 9y²
E. 2y + y²

Question 25:

• JAMB 1980

(\(\frac{x^a}{x^b}\))^{a + b} by (\(\frac{x^{a + b}}{x^{a - b}}\))^{\(\frac{a^2}{b}\)}

A. X^-a2
B. X^b2
C. X^{a2 - b2}
D. \(\frac{1}{x^{a2 + b2}}\)
E. X^{b2 - a2}