Jamb Mathematics 1979 Past Questions and Answers

Question 11:

• JAMB 1979

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:

• JAMB 1979

The mean of the numbers 1.2, 1.0, 0.9, 1.4, 0.8, 0.8, 1.2 and 1.1 is

A. 1.5
B. 0.8
C. 1.0
D. 1.02
E. 1.05

Question 13:

• JAMB 1979

The mean of the numbers 1.2, 1.0, 0.9, 1.4, 0.8, 0.8, 1.2 and 1.1 is

A. 1.5
B. 0.8
C. 1.0
D. 1.02
E. 1.05

Question 14:

• JAMB 1979

$(1.28\times {10}^4)÷(6.4\times {10}^2)$ equals

A. 2 x 10^-5
B. 2 x 10^-1
C. 2 x 10¹
D. 2 x 10^-4

Question 15:

• JAMB 1979

If the value of $\pi$ is taken to be $\frac{22}{7}$, the area of a semi-circle of diameter 42m is

A. 5544m²
B. 1386m²
C. 132m²
D. 264m²
E. 693m²