NUMBER AND NUMERATION - Jamb Mathematics Past Questions and Answers

Question 61:

• JAMB 2017

Given T = { even numbers from 1 to 12 }
N = {common factors of 6, 8 and 12}
Find T ∩ N

A. {2, 3}
B. {2, 3, 4}
C. {3, 4, 6}
D. {2}

Question 62:

• JAMB 2017

Evaluate 1 - (\(\frac{1}{5}\) x \(\frac{2}{3}\)) + ( 5 + \(\frac{2}{3}\))

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

Question 63:

• JAMB 2019

A binary operation \(\otimes\) is defined by \(m \otimes n = mn + m - n\) on the set of real numbers, for all m, n \(\in\) R. Find the value of 3 \(\otimes\) (2 \(\otimes\) 4).

A. 6
B. 25
C. 15
D. 18

Question 64:

• JAMB 2019

Tade bought 200 mangoes at 4 for #2.50. 30 out of the mangoes got spoilt and the remaining were sold at 2 for #2.40. Find the percentage profit or loss.

A. 43.6% loss
B. 35% profit
C. 63.2% profit
D. 28% loss

Question 65:

• JAMB 2019

If \(25^{1 - x} \times 5^{x + 2} \div (\frac{1}{125})^{x} = 625^{-1}\), find the value of x.

A. X = -4
B. X = 2
C. X = -2
D. X = 4