Answer:
They installed 2 7 .6 6 trailers altogether
Explanation:
Given that:
A landscaper installs 12 sections of trail
he's & his partner installs 12.5 sections of Trellis
the neighbor installs $3.16 sections of Trellis.
The number of trailers they install together can be calculated by finding the summation of all the value given.
i.e
The number of trailers they install together;
1 2 . 0 0
= + 1 2 . 5 0
3 . 1 6
2 7 .6 6