document.write( "Question 137173: Jack is 15 years old, and his sister, Jane is 5 years old. In how many years will jack be twice as old as Jane? \n" ); document.write( "
Algebra.Com's Answer #100364 by ankor@dixie-net.com(22740)\"\" \"About 
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Jack is 15 years old, and his sister, Jane is 5 years old. In how many years will jack be twice as old as Jane?
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\n" ); document.write( "You can do this in your head but here is the algebra way.
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\n" ); document.write( "Let x = no. of years for this to happen
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\n" ); document.write( "15 + x = 2(5+x)
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\n" ); document.write( "15 + x = 10 + 2x
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\n" ); document.write( "15 - 10 = 2x - x
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\n" ); document.write( "5 = x; In five yrs Jack will be 20 and Jane will be 10\r
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