document.write( "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.\r
\n" ); document.write( "\n" ); document.write( "A. T+91 B. 2T+91 C.T-91 D.T+2 E.None of these
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Algebra.Com's Answer #380418 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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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
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\n" ); document.write( "Let x = the score required to raise the average to 91
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\n" ); document.write( "The equation
\n" ); document.write( " $\"%28%2890t%2Bx%29%29%2F%28%28t%2B1%29%29\"$ = 91
\n" ); document.write( ":
\n" ); document.write( "multiply both sides by (t+1)
\n" ); document.write( "90t + x = 91(t+1)
\n" ); document.write( "90t + x = 91t + 91
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\n" ); document.write( "Subtract 90t from both sides
\n" ); document.write( "x = 91t - 90t + 91
\n" ); document.write( "x = t + 91 \n" ); document.write( "

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