Mathematics 1990 Jamb Past Questions and Answers

Question 6 :

• JAMB 1990

Three children shared a basket of mangoes in such a way that the first child took \(\frac{1}{4}\) of the mangoes and the second \(\frac{3}{4}\) of the remainder. What fraction of the mangoes did the third child take?

A. \(\frac{3}{16}\)
B. \(\frac{7}{16}\)
C. \(\frac{9}{16}\)
D. \(\frac{13}{16}\)

Question 7 :

• JAMB 1990

Simplify and express in standard form \(\frac{0.00275 \times 0.0064}{0.025 \times 0.08}\)

A. 8.8 x 10^-1
B. 8.8 x 10^-2
C. 8.8 x 10^-3
D. 8.8 x 10³

Question 8 :

• JAMB 1990

three brothers in a business deal share the profit at the end of a contact. The first received \(\frac{1}{3}\) of the profit and the second \(\frac{2}{3}\) of the remainder. If the third received the remaining N12000.00 how much profit did they share?

A. N60 000.00
B. N54 000.00
C. N48 000.00
D. N42 000.00

Question 9 :

• JAMB 1990

Simplify \(\sqrt{160r^2 + \sqrt{71r^4 + \sqrt{100r^8}}}\)

A. 9r²
B. 12\(\sqrt{3r}\)
C. 13r
D. \(\sqrt{13r}\)

Question 10 :

• JAMB 1990

Simplify \(\sqrt{27}\) + \(\frac{3}{\sqrt{3}}\)

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