Jamb 1979 Mathematics Questions
Question 11:
A trader goes to Ghana for y days with y cedis. For the first x days, he spends X cedis per day. The amount he has to spend per day for the rest of his stay is
- A \(\frac{y(y - x)}{y - x}\) cedis
- B \(\frac{Yy - Xx)}{y - x}\) cedis
- C \(\frac{Y - Xy)}{y - x}\) cedis
- D \(\frac{Y - X}{y - x}\) cedis
- E \(\frac{Y - Xx}{y - x}\) cedis
Question 12:
\((1.28 \times 10^{4}) \div (6.4 \times 10^{2})\) equals
- A 2 x 10<sup style='font-size: smaller;'>-5</sup>
- B 2 x 10<sup style='font-size: smaller;'>-1</sup>
- C 2 x 10<sup style='font-size: smaller;'>1</sup>
- D 2 x 10<sup style='font-size: smaller;'>-4</sup>
Question 13:
Multiply (3x + 5y + 4z) by (2x - 3y + z)
- A 6x<sup style='font-size: smaller;'>2</sup> + xy - 15y<sup style='font-size: smaller;'>2</sup> + 4z<sup style='font-size: smaller;'>2</sup> + 11xz - 7yz
- B 6x<sup style='font-size: smaller;'>2</sup> + 3xy - 15y<sup style='font-size: smaller;'>2</sup> + 4z<sup style='font-size: smaller;'>2</sup>
- C 6x<sup style='font-size: smaller;'>2</sup> + 3xy - y<sup style='font-size: smaller;'>2</sup> + 4z<sup style='font-size: smaller;'>2</sup>
- D 6x<sup style='font-size: smaller;'>2</sup> + 3xy - 15y + z<sup style='font-size: smaller;'>2</sup>
Question 14:
A square of cardboard is taped at the perimeter by a piece of ribbon 20cm long. What is the area of the board?
- A 20sq.cm
- B 100sq.cm
- C 25sq.cm
- D 16sq.cm
- E 36sq.cm
Question 15:
Rationalize the denominator of the expression \(\frac{6 + 2\sqrt{5}}{4 - 3\sqrt{6}}\)
- A \(\frac{12+ 4\sqrt{5 + 7} 5 + 6\sqrt{3}}{39}\)
- B \(\frac{-(24 + 18\sqrt{6} + 8\sqrt{5} + 6\sqrt{30})}{39}\)
- C \(\frac{24 + 3\sqrt{6 + 8} 5 + 6\sqrt{30}}{19}\)
- D \(\frac{-15 + 3\sqrt{5 + 18} 5 + 6\sqrt{30}}{36}\)
- E \(\frac{-(12 + 4\sqrt{5} +9\sqrt{6} + 3\sqrt{30})}{19}\)