document.write( "Question 1064206: Using only one variable, The sum of Robin and Bruno's age is 45. Seven years ago, Robin was 16 years more than one-half as old as Bruno was then. How old is Bruno? \n" ); document.write( "
Algebra.Com's Answer #679258 by addingup(3677)\"\" \"About 
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R+B = 45, so R = 45-B
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\n" ); document.write( "R-7 = 16+1/2(B-7) now substitute for R
\n" ); document.write( "(45-B)-7 = 16+1/2B-3.5
\n" ); document.write( "45-B = 23+1/2B-3/2
\n" ); document.write( "45-B = 19.5+1/2B
\n" ); document.write( "25.5 = 1.5B
\n" ); document.write( "B = 25.5/1.5 = 17 Bruno is 17
\n" ); document.write( "And Robin is 45-17 = 28\r
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