SOLUTION: After 8 tests, Sally's average in biology is a 68. Her teacher said she could drop her 2 lowest tests grades (which were the same) Her new average is 72. What were the grades of th

Question 1009062: After 8 tests, Sally's average in biology is a 68. Her teacher said she could drop her 2 lowest tests grades (which were the same) Her new average is 72. What were the grades of the 2 lowest tests?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
.
Total points (8 tests) = number of tests x average
Total points (8 tests) = 8 x 68 = 544
.
Total points (6 tests) = number of tests x average
Total points (6 tests) = 6 x 72 = 432
.
Total points (two lowest tests) = 544 - 432 = 112
Since both low test scores were the same:
Low test score = 112/2 = 56
Her two lowest test scores were 56.
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