document.write( "Question 56902: sally is 3 times older that david in five years sally will be twice as old as david how old will sally be in 5 years \n" ); document.write( "
Algebra.Com's Answer #38630 by askmemath(368)![]() ![]() ![]() You can put this solution on YOUR website! \"sally is 3 times older that david\" \n" ); document.write( "Let David's present age = X \n" ); document.write( "Then Sally's age = 3X\r \n" ); document.write( "\n" ); document.write( "\" in five years\" \n" ); document.write( "David's age = X+5 \n" ); document.write( "Sally's age = 3X+5\r \n" ); document.write( "\n" ); document.write( "\"sally will be twice as old as david\" \n" ); document.write( "3X+5 = 2(X+5) \n" ); document.write( "Solving this \n" ); document.write( "3X+5 = 2X+10 \n" ); document.write( "X = 5 \n" ); document.write( "Which means David's present age = 5 \n" ); document.write( "Sally's present age = 15\r \n" ); document.write( "\n" ); document.write( "\"how old will sally be in 5 years\" \n" ); document.write( "15+5 = 20 years \n" ); document.write( " |