document.write( "Question 1133388: Karen is twice as old as Lori. Three years from now, the sum of their ages will be 42. How old is Karen? \n" ); document.write( "

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\n" ); document.write( "Karen is twice as old as Lori. Three years from now, the sum of their ages will be 42. How old is Karen?
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Let Karen's and Lori's ages be K, and L, respectively
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document.write( "Then we get: K = 2L ------- eq (i)
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document.write( "Also, K + 3 + L + 3 = 42 =====> K + L = 36 ======> L = 36 - K ------- eq (ii)
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document.write( "K = 2(36 - K) ------ Substituting 36 - K for L in eq (i)
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document.write( "K = 72 - 2K
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document.write( "K + 2K = 72
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document.write( "3K = 72
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document.write( "K, or Karen is:  \n" );
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