Jamb Mathematics 1978 Past Questions and Answers

Question 11:

• JAMB 1978

What is the number whose logarithm to base 10 is 2.3482?

A. 223
B. 2228
C. 2.235
D. 22.37
E. 0.2229

Question 12:

• JAMB 1978

Five years ago, a father was 3 times as old as his son, now their combined ages amount to 110years. thus, the present age of the father is

A. 75 years
B. 60 years
C. 98 years
D. 80 years
E. 105 years

Question 13:

• JAMB 1978

If y = 2x² + 9x - 35. Find the range of values for which y < 0.

A. 7 < x < \(\frac{5}{2}\)
B. -5 < 7 < x
C. -7 < x < 5
D. -7 < x < \(\frac{5}{2}\)

Question 14:

• JAMB 1978

Father reduced the quantity of food bought for the family by 10% when he found that the cost of living had increased 15%. Thus the fractional increase in the family food bill is now

A. \(\frac{1}{12}\)
B. \(\frac{6}{35}\)
C. \(\frac{19}{300}\)
D. \(\frac{7}{200}\)
E. \(\frac{5}{100}\)

Question 15:

• JAMB 1978

Given that \(a*b = ab + a + b\) and that \(a ♦ b = a + b = 1\). Find an expression (not involving * or ♦) for (a*b) ♦ (a*c) if a, b, c, are real numbers and the operations on the right are ordinary addition and multiplication of numbers

A. Ac + ab + bc + b + c + 1
B. Ac + ab + a + c + 2
C. Ab + ac + a + b + 1
D. Ac + bc + ab + b + c + 2
E. Ab + ac + 2a + b + c + 1