document.write( "Question 1204684: Mary’s age is 3 more than twice her brother’s age. The sum of their ages is 33. What is Mary’s age? \n" ); document.write( "
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document.write( "Mary’s age is 3 more than twice her brother’s age.  The sum of their ages is 33.  What is Mary’s age?\r\n" );
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document.write( "Let Mary's and her brother's ages be M and B, respectively\r\n" );
document.write( "   Then we get: M = 2B + 3 ---- eq (i)\r\n" );
document.write( "      Also, M + B = 33____B = 33 - M ----- eq (ii)\r\n" );
document.write( "                M = 2(33 - M) + 3 ----- Substituting 33 - M for B in eq (i)\r\n" );
document.write( "                M = 66 - 2M + 3\r\n" );
document.write( "           M + 2M = 66 + 3\r\n" );
document.write( "               3M = 69\r\n" );
document.write( "Mary's age, or
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