SOLUTION: a student is suppose to subtract 15 from a certain number but mistakenly added 25 and the result is 145.find the percentage error.
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Question 1097158: a student is suppose to subtract 15 from a certain number but mistakenly added 25 and the result is 145.find the percentage error.
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
=the initial number
= the intended result
= the result of the mistaken calculation
We know that , so we solve to find :
.
So, , and was the intended result.
The miscalculated result is off by .
As a fraction/percentage of the intended result, that amounts to
= approximately .
So,
or is a reasonable answer.
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