please

   I have a promble:

5,5,5,1=24

       U can use  the symbol like :+ - * /

  but every number U can use one time.

U can change the sequence.

In china this promble are done by grade 3 for primary scholar

   I think it's very diffcult!

  So   I need your  help.

I believe you...my friend. Good  luck!