document.write( "Question 10631: The gym is 21 years older than the auditorium. The gym is also 3 times as old as the auditorium. How old is each building? \n" ); document.write( "
Algebra.Com's Answer #5633 by Earlsdon(6294)\"\" \"About 
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Let G = age of gym and A = age of auditorium.\r
\n" ); document.write( "\n" ); document.write( "G = A + 21 yrs. The gym is 21 years older than the auditorium.
\n" ); document.write( "G = 3A The gym is 3 times as old as the auditorium.
\n" ); document.write( "Since G = G, then:
\n" ); document.write( " A + 21 = 3A Solve for A.
\n" ); document.write( "2A = 21
\n" ); document.write( "A = 10.5 The auditorium is 10.5 years old.\r
\n" ); document.write( "\n" ); document.write( "G = 3A
\n" ); document.write( "G = 3(10.5)
\n" ); document.write( "G = 31.5 The gym is 31.5 years old.
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