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

Question 11:

• JAMB 1978

If a circular paper disc is trimmed in such a way that its circumference is reduced in the ratio 2:5, In what ratio is the surface area reduced?

A. 8 : 125
B. 2 : 5
C. 8 : 25
D. 4 : 25
E. 4 : 10

Question 12:

• JAMB 1978

The smallest number such that when it is divided by 8 has a remainder of 6 and when it is divided by 9, has a remainder of 7 is

A. 387
B. 493
C. 502
D. 441
E. 634

Question 13:

• JAMB 1981

The ratio of the price of a loaf of bread to the price of a packet of sugar in 1975 was r : t. In 1980, the price of a loaf went up by 25% and that of a packet of sugar went up by 10%. Their new ratio is now

A. 40r:50t
B. 44r : 50t
C. 50r : 44t
D. 44r:55t
E. 55r:44t

Question 14:

• JAMB 1981

A baking recipe calls for 2.5kg of sugar and 4.5kg of flour. With this recipe some cakes were baked using 24.5kg of a mixture of sugar and flour. How much sugar was used?

A. 12.25kg
B. 6.75kg
C. 8.75kg
D. 15.75kg
E. 8.25kg

Question 15:

• JAMB 1982

If N560.70 is shared in the ratio 7 : 2 : 1, what is the smallest share?

A. N392.49
B. N56.70
C. N113.40
D. N112.14
E. N56.07