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)![]() ![]() You can put this solution on YOUR website! 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? \n" ); document.write( ": \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 \n" ); document.write( ": \n" ); document.write( ": \n" ); document.write( "Confirm this, 2 yrs ago grandpa was 72 and Johnny was 8. 8 * 9 = 72 \n" ); document.write( " |