SOLUTION: A student has taken T tests and has a 90 average What score must he get on his next test in order to raise his average to 91 ? Please show me the steps. A. T+91 B. 2T+91 C.T-

Question 602805: A student has taken T tests and has a 90 average What score must he get on his next test in order to raise his average to 91 ? Please show me the steps.
A. T+91 B. 2T+91 C.T-91 D.T+2 E.None of these

Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A student has taken T tests and has a 90 average What score must he get on his next test in order to raise his average to 91
:
Let x = the score required to raise the average to 91
:
The equation
= 91
:
multiply both sides by (t+1)
90t + x = 91(t+1)
90t + x = 91t + 91
:
Subtract 90t from both sides
x = 91t - 90t + 91
x = t + 91
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