Core Mathematics

Question 1

1If a : b = 2 : 3 and b : c = 4 : 5, then a : b : c is

Hard

A. 2 : 3 : 5 B. 2 : 4 : 5 C. 8 : 12 : 15 D. 6 : 9 : 10

Question 2

2If US$1 = GH₵ 13.2, convert US$350 to cedis.

Easy

A. GH₵ 363.2 B. GH₵ 26.52 C. GH₵ 462 D. GH₵ 4,620

Question 3

36 workers can build a wall in 17 days. How long will 3 workers take?

Medium

A. 20 days B. 34 days C. 8.5 days D. 17 days

Question 4

4The ratio 15 : 25 simplifies to 3 : 5.

Easy

A. True B. False

Question 5

5If x varies inversely as y, doubling y halves x.

Easy

A. True B. False

Question 6

6A ratio has no units.

Easy

A. True B. False

Question 7

7Decrease 80 in the ratio 3 : 4.

Easy

A. 20 B. 60 C. 64 D. 106.67

Question 8

8y varies directly as x. If y = 20 when x = 5, find y when x = 7. y = ___

Medium

Your answer (fill in the blank)

Question 9

9y varies directly as x. If y = 36 when x = 6, find y when x = 7. y = ___

Medium

Your answer (fill in the blank)

Question 10

10If US$1 = GH₵ 12.5, convert GH₵ 500 to US dollars.

Medium

A. US$400 B. US$487.5 C. US$40 D. US$6,250