document.write( "Question 1053655: In two years bob will be three times as old as Al. 8 years ago, Bob was 5 times his age. How old is bob now? \n" ); document.write( "
Algebra.Com's Answer #668858 by addingup(3677)![]() ![]() You can put this solution on YOUR website! I just answered this question: \n" ); document.write( "Let Bob be b and Al A. \n" ); document.write( "b+2 = 3(a+2) = 3a+6 \n" ); document.write( "b = 3a+4 \n" ); document.write( "b-8 = 5(a-8) \n" ); document.write( "b-8 = 5a-40 substitute for b: \n" ); document.write( "3a+4-8 = 5a-40 \n" ); document.write( "3a-4 = 5a-40 \n" ); document.write( "36 = 2a \n" ); document.write( "flip it: \n" ); document.write( "2a = 36 \n" ); document.write( "a = 18 Al is 18 \n" ); document.write( "b = 3a+4 = 3(18)+4 = 54+4 = 58 Bob is 58 \n" ); document.write( "-------------------------------------------- \n" ); document.write( "Check: \n" ); document.write( "In 2 years Bob will be 3* older than Al \n" ); document.write( "58+2 = 60 and 18+2 = 20 and 20*3 = 60 Correct \n" ); document.write( "and \n" ); document.write( "8 years ago Bob was 5 times Al \n" ); document.write( "58-8 = 5(18-8) = 50 = 5*10 Correct \n" ); document.write( " |