How to concatenate constants and expressions in report field

I was receiving [BC30205] End of statement expected Error
when I tryed to concatenate:

=INT(AVG(Fields!HT.Value)/360) ":" &INT(AVG(Fields!HT.Value)/60)

Please hlp!
Thank you.

You must convert to a string type.

= CSTR(INT(AVG(Fields!HT.Value)/360))+":"+CSTR(INT(AVG(Fields!HT.Value)/60))