Answer:
16. n = 15
17. n = 5
18. n = 14
19. n = 7
20. n = 16
Step-by-step explanation:
1. 4:5 = 12:n
(4)n = 5(12)
(4)n = 60
4n/4 = 60/4
n = 15
2. 5n + 3n = 40
8n = 40
8n/8 = 40
n = 5
3. 7:8 = n:16
(8)n = 7(16)
(8)n = 112
8n/8 = 112/8
n = 14
4. 2n + 3n + 4n = 63
9n = 63
9n/9 = 63/9
n = 7
5. 8:12 = n:24
(12)n = 8(24)
(12)n = 192
12n/12 = 192/12
n = 16
I hope I helped you!
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