NUMBER AND NUMERATION - Jamb Mathematics Past Questions and Answers

Question 186:

• JAMB 1980

If it is given that 5^{x + 1} + 5^x = 150, then the value of x is equal to

A. 3
B. 4
C. 1
D. 2
E. \(\frac{1}{2}\)

Question 187:

• JAMB 1980

Given log 2 = 0.69, log3 = 1, 10 and log7 = 1.90, all to a fixed base, find log 10.5 to the same base without using tables.

A. 1.03
B. 2.31
C. 3.69
D. 10.5
E. 25

Question 188:

• JAMB 1980

Simplify 10² + log₁₀5

A. 500
B. 2 log₁₀ 5
C. 10
D. 25
E. Log₁₀5 x 10¹⁰⁰

Question 189:

• JAMB 1980

Find the missing numerator \(\frac{5}{x + 1}\) - \(\frac{3}{1 - x}\) - \(\frac{7x - 1}{x^2 - 1}\) = \(\frac{?}{x + 1}\).

A. -1
B. X - 1
C. \(\frac{3(1 - 5x)}{x + 1}\)
D. 1
E. 3(1 - 5x)

Question 190:

• JAMB 1980

Write the decimal number 39 to base 2

A. 10011 base 2
B. 110111 base 2
C. 111001 base 2
D. 100101 base 2
E. 19.5 base 2