NUMBER AND NUMERATION - Jamb Mathematics Past Questions and Answers

Question 201:

• JAMB 1981

The number 25 when converted from the tens and units base to the binary base (base two) is one of the following

A. 10011
B. 111011
C. 111000
D. 11001
E. 110011

Question 202:

• JAMB 1981

Evaluate \(\frac{6.3 \times 10^5}{8.1 \times 10^3}\) to 3 significant fiqures

A. 77.80
B. 778.0
C. 7.870
D. 8.770
E. 88.70

Question 203:

• JAMB 1981

A baking recipe calls for 2.5kg of sugar and 4.5kg of flour. With this recipe some cakes were baked using 24.5kg of a mixture of sugar and flour. How much sugar was used?

A. 12.25kg
B. 6.75kg
C. 8.75kg
D. 15.75kg
E. 8.25kg

Question 204:

• JAMB 1981

The difference between 4\(\frac{5}{7}\) and 2\(\frac{1}{4}\) greater by

A. \(\frac{23}{28}\)
B. \(\frac{24}{28}\)
C. \(\frac{50}{56}\)
D. \(\frac{27}{28}\)
E. \(\frac{48}{56}\)

Question 205:

• JAMB 1981

Solve the given equation \((\log_{3} x)^{2} - 6(\log_{3} x) + 9 = 0\)

A. 27
B. 9
C. \(\frac{1}{27}\)
D. 18
E. 81