Jamb Mathematics 1989 Past Questions and Answers

Question 6:

• JAMB 1989

Simplify \(\sqrt[3]{(64r^{-6})^{\frac{1}{2}}}\)

A. \(\frac{r}{2}\)
B. 2r
C. \(\frac{1}{2r}\)
D. \(\frac{2}{r}\)

Question 7:

• JAMB 1989

What is the different between 0.007685 correct to three significant figures and 0.007685 correct to four places of decimal?

A. 10^-5
B. 7 x 10^-4
C. 8 x 10^-5
D. 10^-6

Question 8:

• JAMB 1989

If a : b = 5 : 8, x : y = 25 : 16; evaluate \(\frac{a}{x}\) : \(\frac{b}{y}\)

A. 125 : 128
B. 3 : 5
C. 3 : 4
D. 2 : 5

Question 9:

• JAMB 1989

Oke deposited N800.00 in the bank at the rate of 12\(\frac{1}{2}\)% simple interest. After some time the total amount was one and half times the principal. For how many years was the money left in the bank?

A. 2\(\frac{2}{3}\)
B. 4
C. 5\(\frac{1}{3}\)
D. 8

Question 10:

• JAMB 1989

If the surface area of a sphere increased by 44%, find the percentage increase in diameter

A. 44
B. 30
C. 22
D. 20