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

\((1.28 \times 10^{4}) \div (6.4 \times 10^{2})\) 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