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Answer :

25
The other polygon the top is 5 less than the longer side. If they are similar the top of the first polygon must be 25.

Answer:

24

Step-by-step explanation:

20           x

----    =    ----

25          30

Cross Multiply (20, 30 and 25, x)

25x = 600

Divide both sides by 25

x = 24