What is the answer please

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

3.4a=57.8 what is the the value of a

A)a square brown tarp has a square green patch green in the corner the side length of the tarp is (x + 8) and the side length of the patch is x what is the area of the brown part of the tarpb)a square red placemat has a gold square in the corner the side length of the gold square is (x - 2) inches with the width of the red region is 4 in what is the area of the red part of the placemat