Questions on Word Problems: Problems with consecutive odd even integers answered by real tutors!

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Question 149453: how do you do, After 5 tests, a student’s average was 80. After taking an examination which
counted as two test grades, his average dropped to 76. What was his grade on that
examination?: how do you do, After 5 tests, a student’s average was 80. After taking an examination which
counted as two test grades, his average dropped to 76. What was his grade on that
examination?
Answer by scott8148(2759) About Me  (Show Source):
You can put this solution on YOUR website!
after 5 grades with an 80 average, his aggregate (total score) was 5*80 or 400

after 7 grades with an 76 average, his aggregate (total score) was 7*76 or 532

the difference (132) is the double test grade __ so his test grade was 132/2 or 66