document.write( "Question 515300: Edwin is four times as old as Joshua. In 12 years, Joshua's age will be half that of Edwin's. How old are they? \n" ); document.write( "
Algebra.Com's Answer #343919 by Maths68(1474)\"\" \"About 
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Let
\n" ); document.write( "Present age of Joshua = j
\n" ); document.write( "Present age of Edwin = e \r
\n" ); document.write( "\n" ); document.write( "Edwin is four times as old as Joshua.
\n" ); document.write( "e=4j........(1)
\n" ); document.write( "In 12 years
\n" ); document.write( "e+12=j+12
\n" ); document.write( "then, Joshua's age will be half that of Edwin's
\n" ); document.write( "(e+12)*1/2=(j+12)
\n" ); document.write( "(e+12)=2(j+12)
\n" ); document.write( "e+12=2j+24
\n" ); document.write( "e=2j+24-12
\n" ); document.write( "e=2j+12
\n" ); document.write( "Put the value of e from (1) to above equation
\n" ); document.write( "e=2j+12
\n" ); document.write( "4j=2j+12
\n" ); document.write( "4j-2j=12
\n" ); document.write( "2j=12
\n" ); document.write( "2j/2=12/2
\n" ); document.write( "j=6
\n" ); document.write( "Put the value of j in (1)
\n" ); document.write( "e=4j
\n" ); document.write( "e=4*6
\n" ); document.write( "e=24
\n" ); document.write( "Present age of Joshua = j= 6 years old
\n" ); document.write( "Present age of Edwin = e = 24 years old\r
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