document.write( "Question 1113638: Wilma is 13 years older than Bev. In nine years, Wilma will be twice as old as Bev. How old is Bev? \n" ); document.write( "
Algebra.Com's Answer #728715 by rothauserc(4718)\"\" \"About 
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let w be Wilma's age and b be Bev's age
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\n" ); document.write( "1) w = b +13
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\n" ); document.write( "2) w +9 = 2(b+9)
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\n" ); document.write( "use equation 1 and substitute for w in equation 2
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\n" ); document.write( "b +13 +9 = 2b +18
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\n" ); document.write( "b = 4
\n" ); document.write( "w = 4 +13 = 17
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\n" ); document.write( "Wilma is 17 and Bev is 4
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\n" ); document.write( "check answer in equation 2
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\n" ); document.write( "17 +9 = 2(4+9)
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\n" ); document.write( "26 = 26
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