document.write( "Question 972276: Tom's mother gave birth to Tom when she was 21 years old. how old will Tom be when his mother's age is 4 times of his age? \n" ); document.write( "
Algebra.Com's Answer #594602 by amarjeeth123(569)\"\" \"About 
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Let the number of years be x.
\n" ); document.write( "We have 21+x=4x
\n" ); document.write( "3x=21
\n" ); document.write( "x=7
\n" ); document.write( "Tom will be 7 years old when his mother is 4 times his age.
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