document.write( "Question 988754: Johnny is 10 and his granddad is 74. How many years ago was johnny's granddad 9 times as old as johnny? \n" ); document.write( "
Algebra.Com's Answer #609234 by ankor@dixie-net.com(22740)\"\" \"About 
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Johnny is 10 and his granddad is 74.
\n" ); document.write( " How many years ago was johnny's granddad 9 times as old as johnny?
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\n" ); document.write( "let y = no. of years ago that this was true
\n" ); document.write( "74 - y = 9(10 - y)
\n" ); document.write( "74 - y = 90 - 9y
\n" ); document.write( "-y + 9y = 90 - 74
\n" ); document.write( "8y = 16
\n" ); document.write( "y = 16/8
\n" ); document.write( "y = 2 yrs ago
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\n" ); document.write( "Confirm this, 2 yrs ago grandpa was 72 and Johnny was 8. 8 * 9 = 72
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