document.write( "Question 1165625: The sum of the ages of mark and Sarah is 102 years. 11 years ago mark was 3 times Sarah’s age. How old is mark now? \n" ); document.write( "

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\n" ); document.write( "The sum of the ages of mark and Sarah is 102 years. 11 years ago mark was 3 times Sarah’s age. How old is mark now?
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Let Mark's age be M
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document.write( "Then Sarah's is: 102 - M
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document.write( "We then get: M - 11 = 3(102 - M - 11)
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document.write( "M - 11 = 3(91 - M)
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document.write( "M - 11 = 273 - 3M
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document.write( "M + 3M = 273 + 11
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document.write( "4M = 284
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document.write( "Mark, or  \n" );
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