this is a little tricker than I'm used to for a skill testing question. Please help.
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The order in which you do the calculations can be remembered using "BODMAS"
Always do arithmetic in the following order:
It's explained well here:
So for your example: 25+80-5/2*4
First divide 5 by 2, then multiply that by 4. Add 25 to 80 then take the result of the previous multiplication from this addition.