Question

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Answer 1

72/8 = 9
n/5=9
n=9*5
n=45

2nd one
cross multiply and get 4n=18*9
4n=162
n=162/4
n=(81/2) or 40.5 depending on if it needs to be a fraction or decimal

Answer 2

`(n)/(5) = (72)/(8) \\ \\ (n)/(5) = 9 \\ \\ n = 9 * 5 \\ \\ n = 45 \\ \\`

The final result is: n = 45.

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`(9)/(n) = (4)/(18) \\ \\ (9)/(n) = (2)/(9) \\ \\ 9 = (2)/(9) n \\ \\ 9 = (2n)/(9) \\ \\ 9 * 9 = 2n \\ \\ 81 = 2n \\ \\ (81)/(2) = n \\ \\ n = (81)/(2) \\ \\`

The final result is: n = 81/2 or n = 40.5.