What is 5-5x5+5?

Depends if you're following BODMAS.

BODMAS would make the answer 25 (if I've remembered it right)

5 X 5 = 25

25 - 5 = 20

20+5 = 25

I now await being told I'm wrong
 
Using operand priotities, -15 (try using the scientific calculator)
priorities give 5 - (5x5) + 5 or 5-25+5
 
I was taught to do the times by first. So to me that would be:

5x5=25
5-25=20
20+5

Gets you 25.

Been a while since I bothered doing math tbh, I may have messed up somewhere.
 
In UK (maths not math) it would probably have brackets around part of it and we were taught to do that part first in school during the 70-80's.
 
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