Haley's class recycled 5 5/6 boxes of paper in a month. if they recycled another 5 /45 boxes the next month what is the total amount they recycled

So what they want you to do is add
simplify 5/45
5/45=1/9

5 and 5/6+1/9
5 and 5/6=5+5/6 so
5+5/6+1/9
we only need to focus on the 5/6+1/9 part so
to add convert bottom number to same number
answer is 18
multiply 5/6 by 3/3 to get 15/18
multiply 1/9 by 2/2 to get 2/18
add
15/18+2/18=17/18
answer is
they recycled 5 and 17/18

Where are the calculations?