Answer:
For 18 : 24 = n :60
Answer: n = 45
For 36 : n = 4 : 1
Answer: n = 9
For 105 : n = 45 : 3
Answer: n = 7
Solutions:
For 18 : 24 = n :60
18 : 24 = n :60
(24) (n) = (18) (60)
24n = 1080
24n / 24 = 1080 / 24
n = 45
For 36 : n = 4 : 1
36 : n = 4 : 1
(n) (4) = (36) (1)
4n = 36
4n / 4 = 36 / 4
n = 9
For 105 : n = 45 : 3
105 : n = 45 : 3
(n) (45) = (105) (3)
45n = 315
45n / 45 = 315 / 45
n = 7