I know this question is easy, but I don’t really know how to do it? Help? If possible put a quick explanation, it’s fine if not!!

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?

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