document.write( "Question 1155563: Mary is 16 years older than David, David is 13 years younger than Charlie. If the sum of their ages is 62, how old is Mary? \n" ); document.write( "

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\n" ); document.write( "Mary is 16 years older than David, David is 13 years younger than Charlie. If the sum of their ages is 62, how old is Mary?
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Let Mary's age be M
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document.write( "Then David's is: M - 16, and Charlie's is: M - 16 + 13. or M - 3
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document.write( "Since all ages sum to 62, we get: M + M - 16 + M - 3 = 62
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document.write( "3M = 81
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document.write( "M, or Mary is:  \n" );
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