document.write( "Question 798886: Mary's father is four times as old as Mary. Five years ago, he was seven times as old. How old is each now? \n" ); document.write( "
Algebra.Com's Answer #482401 by Cromlix(4381)![]() ![]() You can put this solution on YOUR website! Mary's father is four times as old as Mary \n" ); document.write( "F = 4M \n" ); document.write( "F - 5 = 7(M - 5) \n" ); document.write( "Replace F with $M from first equation. \n" ); document.write( "4M - 5 = 7M - 35 \n" ); document.write( "Collect like terms; \n" ); document.write( "4M - 7M = -35 + 5 \n" ); document.write( "- 3M = - 30 \n" ); document.write( "M = 10 \n" ); document.write( "Currently, \n" ); document.write( "Mary is 10 years old \n" ); document.write( "Father is 40 years old. \n" ); document.write( "Hope this helps. \n" ); document.write( ":-) \n" ); document.write( " \n" ); document.write( " |