You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.

[EX Q]: Sam found 35 seashells on the beach, he gave Joan 18 of theseashells. How many seashells does he now have?
[EX A]: 17.0

[EX Q]: There are 43 pencils in the drawer and 19 pencils on the desk. Danplaced 16 pencils on the desk. How many pencils are now there intotal?
[EX A]: 78.0

[EX Q]: There were 2 red orchids and 4 white orchids in the vase. Jessica cutsome red orchids from her flower garden. There are now 18 redorchids in the vase. How many red orchids did she cut?
[EX A]:
16.0