Try this! Real fun!

my sister showed me this question and i thought i have the ability to solve it cause...

she said it was damn easy, even though she didn't get it right,
and i secretly believe i'm more clever than her.

but after thinking about it for nearly half an hour, i still couldn't get it right.

but it's actually really very easy! it's the kind of question which a 4 year old might get it right but normal adults can't. sounds impossible? then try this!

(i have a feeling some of you might get this right somehow)

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if

1 = 5

2 = 25

3 = 125

4 = 625

5 = ?

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answer in the comments!