Posted by matt on Saturday, October 16, 2010 at 7:17pm.
tom scores 83,88,75, and 90 on the first 4 tests in algebra. what does he need to get on the 5th test to have an average of 85?

ALgebra  Ms. Sue, Saturday, October 16, 2010 at 7:25pm
Assuming that the total possible score on each test, then the total possible points for 5 tests is 100.
0.85 * 500 = 425
He has a total of 336 points now.
425  336 = 89

ALgebra  Jen, Saturday, October 16, 2010 at 9:57pm
You can also do this problem this way:
(83+88+75+90+x)/5=85
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