Verified Answer :

5/25
This can be simplified to 1/5
1/5 = 13/?
In order to get to 13 from 1 you must multiply by 13
If we multiply the bottom (denominator) by 13 we get the missing value
5 x 13 = 65

5/25 = 13/65

This a proportion.

Lets solve by cross multiplying.

5/25 = 13/x

5 x = 5x                13 25 = 325

325 = 5x

5x/5 = 325/5
x= 325/5             x= 65

Answer:   5/25 = 13/65

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