SOLUTION: JUDY NEEDS A MEAN(AVERAGE) SCORE OF 86 ON FOUR TESTS TO EARN A MIDTERM GRADE OF B. IF THE MEAN OF HER SCORES FOR THE FIRST THREE TEST WAS 83, WHAT IS THE LOWEST SCORE ON A 100-POIN

Question 666440: JUDY NEEDS A MEAN(AVERAGE) SCORE OF 86 ON FOUR TESTS TO EARN A MIDTERM GRADE OF B. IF THE MEAN OF HER SCORES FOR THE FIRST THREE TEST WAS 83, WHAT IS THE LOWEST SCORE ON A 100-POINT SCALE THAT SHE CAN RECEIVE ON THE FOURTH TEST TO HAVE A MIDTERM GRADE OF B ?
Answer by ReadingBoosters(3246) (Show Source): You can put this solution on YOUR website!
Given her 83 average on the first three tests, solve for her total points on those tests...

Multiply both sides by 3
y = 249 total scores of tests 1, 2 and 3
...
Having 249 accumulated on the first three tests, solve for the score needed on the fourth test for an average of 86...

Multiply both sides by 4
249 + x = 344
Isolate x
x = 344-249
is needed on the fourth test
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