SOLUTION: Your test scores in science are 100, 85, 80, 80, 100. What will ypu have to get on the last test to average a 90.

Question 741385: Your test scores in science are 100, 85, 80, 80, 100. What will ypu have to get on the last test to average a 90.
Answer by blwinbbbles(106) (Show Source): You can put this solution on YOUR website!
An average is all the scores added up then divided by the number of scores. We know there is one more test...so
100+85+80+80+100+x/6 = 90
x=the test score not taken
and 6 is total number of test there will be
add up the numbers
445 + x / 6 =90
mulitple both sides by 6
445+x = 540
Subtract 445 from both sides
x = 95
so you will need a 95 on the final exam
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