SOLUTION: a student scored 70% on a test that contains 30 questions to improve his score the instructor agrees to let him work 15 additional questions how many must he get right to raise his

Algebra ->  Equations -> SOLUTION: a student scored 70% on a test that contains 30 questions to improve his score the instructor agrees to let him work 15 additional questions how many must he get right to raise his      Log On


   

Question 1185713: a student scored 70% on a test that contains 30 questions to improve his score the instructor agrees to let him work 15 additional questions how many must he get right to raise his grade to 80%
Answer by greenestamps(13198) About Me  (Show Source):
You can put this solution on YOUR website!


70% of 30 is 21; he originally got 21 right.

80% of (30+15) = 45 is 36.

36-21=15

ANSWER: He has to get all 15 of the additional questions right to raise his grade to 80%.