document.write( "Question 27157: the sun of scotts age and his mothers age is 45. in 5 years time, three times scotts age less 9 will be the same as his mothers age. find the present ages of scott and his other. \n" ); document.write( "
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S + M = 45
\n" ); document.write( "In 5 years time Scott will be S+5 years old and Mum will be M+5
\n" ); document.write( "3*(S+5)-9=M+5
\n" ); document.write( "3S+6=M+5
\n" ); document.write( "M=3S+1
\n" ); document.write( "And from the original equation
\n" ); document.write( "M=45-S
\n" ); document.write( "so
\n" ); document.write( "45-S=3S+1
\n" ); document.write( "45-S+S=3S+1+S
\n" ); document.write( "45=4S+1
\n" ); document.write( "44=4S
\n" ); document.write( "so Scott is currently 11 and mum is currently 34
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