Mathematics Past Questions and Answers

Question 51:

• JAMB 2019

The weight of a day-old chick was measured to be 0.21g. If the actual weight of the chick is 0.18g, what was the percentage error in the measurement?

A. 15.5%
B. 18.2%
C. 14.8%
D. 16.7%

Question 52:

• JAMB 2019

Evaluate $(\frac{6}{0.32}÷\frac{2}{0.084}{)}^{-1}$ correct to 1 decimal place.

A. 1.3
B. 2.5
C. 4.6
D. 3.2

Question 53:

• JAMB 2019

If 2${}^{x+y}$ = 16 and 4${}^{x-y}=\frac{1}{32}$, find the values of x and y.

A. X = $\frac{3}{4}$, y = $\frac{11}{4}$
B. X = $\frac{3}{4}$, y = $\frac{13}{4}$
C. X = $\frac{2}{3}$, y = $\frac{4}{5}$
D. X = $\frac{2}{3}$, y = $\frac{13}{4}$

Question 54:

• JAMB 2019

Simplify $\frac{0.0839\times 6.381}{5.44}$ to 2 significant figures.

A. 0.2809
B. 2.51
C. 3.5
D. 0.098

Question 55:

• JAMB 2019

Find the value of x and y in the simultaneous equation: 3x + y = 21; xy = 30

A. X = 3 or 7, y = 12 or 8
B. X = 6 or 1, y = 11 or 5
C. X = 2 or 5, y = 15 or 6
D. X = 1 or 5, y = 10 or 7