document.write( "Question 1164747: Robert is thinking that his father is 7 years older than twice his age, his grandfather is 4 years less than twice his father’s age. If Robert’s grandfather is 70 years old, how old is Robert ? \n" ); document.write( "
Algebra.Com's Answer #789157 by Alan3354(69443)![]() ![]() You can put this solution on YOUR website! Robert is thinking that his father is 7 years older than twice his age, his grandfather is 4 years less than twice his father’s age. If Robert’s grandfather is 70 years old, how old is Robert ? \n" ); document.write( "----------------- \n" ); document.write( "R = Robert's age \n" ); document.write( "F = 2R + 7 \n" ); document.write( "G = 2F - 4 = 70 \n" ); document.write( "----- \n" ); document.write( "Solve for F, then solve for R \n" ); document.write( " |