document.write( "Question 1125464: The ratio of Tom’s age to Mary is 3:4, if Tom is 15, how old is Mary? \n" ); document.write( "

Algebra.Com's Answer #741788 by ikleyn(52788) $\"\"$ $\"About$

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document.write( "According to the condition,  Tom is 3x years old, while Mary is 4x years old, where x is the common measure of their ages.\r\n" );
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document.write( "Since  3x = 15  (Tom's age), it implies  x= 15/3 = 5.\r\n" );
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document.write( "Hence, Mary is 4*5 = 20 years old.    ANSWER.\r\n" );
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