Q.   Fill the boxes using   ( 1,3,5,7,9,11,13,15 )  you can also repeat the numbers 

Dear Student,
Your question is not correct. As all numbers are odd and adding odd number 3 times should give odd, not even number.
Although if it a puzzle, you can proceed in following way :
3! + 11 + 13 or 3! + 9 +15. 
As 3! =6. 
Regards

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