SOLUTION: On the first 3 exams of his language class, Ishaan got an average score of 85. What does he need on the next exam to have an overall average of 88? please help me Thank You

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Question 914259: On the first 3 exams of his language class, Ishaan got an average score of 85.
What does he need on the next exam to have an overall average of 88? please help me Thank You

Found 2 solutions by fave, josmiceli:
Answer by fave(7) (Show Source):
You can put this solution on YOUR website!
let a,b,c represent the first three exams ishaan took
so, a+b+c/3=85

a+b+c=255...
let d represent the next exam ishaan will take,so that

255+d/4 =88

255+d=88(4)
255+d=352
d=352-255=97
Ishaan needs a score of 97 in his next exam to get an average of 88 after taking four exams.

Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website!
Average grade = ( total of the grades ) / ( total number of tests )
Total number of tests =
Let = his grade on the 4th test
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His ( total of grades ) for the first 3 tests was:
( average grade ) x ( number of tests ) = total of grades

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I can say:

He needs a 97 on the 4th test
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check:

OK