document.write( "Question 1183468: Joseph is six years older than his sister .their combined age is the same as their father their father's age .if their father is 50yrs old how old is joseph and her sister \n" ); document.write( "
Algebra.Com's Answer #813808 by ankor@dixie-net.com(22740)\"\" \"About 
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Joseph is six years older than his sister
\n" ); document.write( "j = s + 6
\n" ); document.write( " .their combined age is the same as their father's age .if their father is 50yrs old
\n" ); document.write( "j + s = 50
\n" ); document.write( ";
\n" ); document.write( "how old is joseph and her sister
\n" ); document.write( "rearrange the 1st equation and use elimination with 2nd equation
\n" ); document.write( "j - s = 6
\n" ); document.write( "j + s = 50
\n" ); document.write( "-------------- addition eliminates s, find j
\n" ); document.write( "2j + 0 = 56
\n" ); document.write( "j = 56/2
\n" ); document.write( "j = 28 yrs is Joseph's age
\n" ); document.write( "then
\n" ); document.write( "28 + s = 50
\n" ); document.write( "s = 50 - 28
\n" ); document.write( "s = 22 yrs is sister's age
\n" ); document.write( ":
\n" ); document.write( "confirm in the 1st equation
\n" ); document.write( "28 = 22 + 6
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