Answer:
18. b. 4/14
19. b. 30/40
20. c. 21/48
21. a. 9/20
22. a. 6/24
Explanation:
So in these questions all we do is multiply the fractions.
18)

4*1 = 4
7*2 = 14
b. 4/14
19)

15*2 = 30
2*20 = 40
b. 30/40
20)

3*7 = 21
6*8 = 48
c. 21/48
21)

9*1 = 9
10*2 = 20
a. 9/20
22)

3*2 = 6
6*4=24
a. 6/24
Hope this helps :)