math homwork

how make 15 + (22/4) = 6 ?
use modulo arithmetic
eg ...
15 + (22/4) = 15 + 5.5 = 20.5
with 20.5 take the floor = 20
then do (20 modulo 14) = 6
or ...
with 20.5 take the ceiling = 21
then do (21 modulo 15) = 6
where
modulo is an arithmetic operator?