Ratio, proportion and rate - Jamb Mathematics Past Questions and Answers

Question 21:

• JAMB 1986

A number of pencils were shared out among Bisi, Sola and Tunde in the ratio of 2 : 3 : 5 respectively. If Bisi got 5, how many were share out?

A. 15
B. 25
C. 30
D. 50

Question 22:

• JAMB 1987

Four boys and ten girls can cut a field in 5 hours if the boys work at \(\frac{5}{4}\) the rate at which the girls work. How many boys will be needed to cut the field in 3 hours?

A. 180
B. 60
C. 25
D. 20

Question 23:

• JAMB 1988

Two sisters, Taiwo and Keyinde, own a store. The ratio of Taiwo's share to Kehinde's is 11:9. Later, Keyinde sells \(\frac{2}{3}\) of her share to Taiwo for N720.00. Find the value of the store.

A. N1,080.00
B. N2,400.00
C. N3,000.00
D. N3,600.00

Question 24:

• JAMB 1989

If a : b = 5 : 8, x : y = 25 : 16; evaluate \(\frac{a}{x}\) : \(\frac{b}{y}\)

A. 125 : 128
B. 3 : 5
C. 3 : 4
D. 2 : 5

Question 25:

• JAMB 1990

Three children shared a basket of mangoes in such a way that the first child took \(\frac{1}{4}\) of the mangoes and the second \(\frac{3}{4}\) of the remainder. What fraction of the mangoes did the third child take?

A. \(\frac{3}{16}\)
B. \(\frac{7}{16}\)
C. \(\frac{9}{16}\)
D. \(\frac{13}{16}\)