Jamb Mathematics 2015 Past Questions and Answers

Question 16:

• JAMB 2015

If log₅20 = x, find x

A. 1.761
B. 1.354
C. 1.861
D. 2.549

Question 17:

• JAMB 2015

Find at which rate per annum simple interest N525 will amount to N588 in 3 years.

A. 3%
B. 2%
C. 5%
D. 4%

Question 18:

• JAMB 2015

Find the range of values of t which satisfies the inequality.
2t − 1 \(\leq\) 3 and 2− t \(\geq\) 5

A. -3 \(\leq\) t \(\leq\) 1
B. -2 \(\leq\) t \(\leq\) 3
C. -3 \(\leq\) t \(\leq\) 4
D. -3 \(\leq\) t \(\leq\) 2

Question 19:

• JAMB 2015

Given that A = {1, 5, 7}
B = {3, 9, 12, 15}
C = {2, 4, 6, 8}
Find (A ∪ B) ∪ C

A. {1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15}
B. {1, 2, 3, 5, 6, 8, 12, 15}
C. {2, 4, 5, 9, 12, 15}
D. {1, 5, 6, 7, 8, 9, 12, 15}

Question 20:

• JAMB 2015

The extension of a stretched string is directly proportional to its tension. If the extension produced by a tension of 8 Newton’s is 2cm, find the extension produced by a tension of 12 newton’s.

A. 2
B. 1
D. 3