其它
The ages of Tom\textquotesingle s father, Tom\textquotesingle s mother and Tom are $86$ together. Tom\textquotesingle s mother is $24$ years older than Tom and~~$2$ years younger than Tom\textquotesingle s father.How old is Tom? 
Overseas Competition->Knowledge Point->Word Problem Modules->Questions Involving Sum, Difference and Multiples->Problems of Sum and Multiple
Tom\textquotesingle s mother is $(86+24-2)\div3=36$ years old.  Tom is $36-24=12$ years old. 