Jamb Mathematics Past Questions For Year 1981
Question 21
Solve \(\frac{1}{x + 1}\) - \(\frac{1}{x + 3}\) = \(\frac{1}{4}\)
- A. x = -1 or 3
- B. x = 1 or 3
- C. x = 1 or -5
- D. x = -1 or 5
- E. x = -1 or -3
Question 22
In \(\bigtriangleup\)XYZ, XY = 3cm, XZ = 5cm and YZ = 7cm. If the bisector of XYZ meets XZ at W, what is the length of XW?
- A. 1.5cm
- B. 2.5cm
- C. 3cm
- D. 4cm
- E. None of the above
Question 23
If \(\log_{2} y = 3 - \log_{2} x^{\frac{3}{2}}\), find y when x = 4.
- A. 8
- B. \(\sqrt{65}\)
- C. 4\(\sqrt{2}\)
- D. 3
- E. 1
Question 24
Given that 10\(^x\) = 0.2 and log10\(^2\) = 0.3010, find x
- A. -1.3010
- B. -0.6990
- C. 0.6990
- D. 1.3010
- E. 0.02
Question 25
Two cars X and Y start at the same point and travel towards a point P which is 150km away. If the average speed of Y is 60km per hour and x arrives at P 25 minutes earlier than Y. What is the average speed of X?
- A. 51\(\frac{3}{7}\)km per hour
- B. 72km per hour
- C. 37\(\frac{1}{2}\) km per hour
- D. 66km per hour
- E. 75km per hour
