document.write( "Question 720877: In 10 years,A will be twice as old as B was 10 Years ago.If A is now 9 years older than B,the present age of B is? \n" ); document.write( "
Algebra.Com's Answer #442099 by ankor@dixie-net.com(22740)\"\" \"About 
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In 10 years, A will be twice as old as B was 10 Years ago.
\n" ); document.write( "a + 10 = 2(b-10)
\n" ); document.write( "a + 10 = 2b - 20
\n" ); document.write( "a = 2b - 20 -10
\n" ); document.write( "a = 2b - 30
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\n" ); document.write( "If A is now 9 years older than B,
\n" ); document.write( "a = b + 9
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\n" ); document.write( "the present age of B is?
\n" ); document.write( "replace a with (2b-30)
\n" ); document.write( "2b - 30 = b + 9
\n" ); document.write( "2b - b = 9 + 30
\n" ); document.write( "b = 39 yrs old
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\n" ); document.write( "Check this in the statement: (a: 39+9 = 48)
\n" ); document.write( "\"In 10 years, A will be twice as old as B was 10 Years ago.\"
\n" ); document.write( "48 + 10 = 2(39-10)
\n" ); document.write( "58 = 2(29)
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