Jamb Mathematics Past Questions For Year 1979
Question 21
x is directly proportional to y and inversely proportional to z. If x = 9 when y = 24 and z = 8, what is the value of x when y = 5 and z = 6?
- A. \(\frac{5}{6}\)
- B. 11
- C. 3\(\frac{3}{5}\)
- D. 2\(\frac{1}{2}\)
- E. 1\(\frac{1}{5}\)
Question 22
The solution of the equation x\(^2\)- 2x = 8 is
- A. x = 0 or 2
- B. x = -2 or 4
- C. x = 2
- D. x = -4
- E. x = 2 or 4
Question 23
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 24
Multiply (3x + 5y + 4z) by (2x - 3y + z)
- A. 6x2 + xy - 15y2 + 4z2 + 11xz - 7yz
- B. 6x2 + 3xy - 15y2 + 4z2
- C. 6x2 + 3xy - y2 + 4z2
- D. 6x2 + 3xy - 15y + z2
Question 25
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
