When Peter\textquotesingle s age is divided by $2$, $4$ or $6$, there is always a remainder of $1$. But when divided by $7$ there is a remainder $5$. How old is Peter? 
Overseas Competition->Knowledge Point->Number Theory Modules->Factors and Multiples->Common Factors and Common Multiples->Common Multiples and Least Common Multiples->Least Common Multiple of Multiple Numbers