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]: Nancy found 35 seashells and 25 starfish on the beach. She gave 17of the seashells to Jason. How many seashells does Nancy now have?
[EX A]: 18.0

[EX Q]: Joan has 47 green and 48 red marbles. Fred took 24 of Joan's greenmarbles. How many green marbles does Joan now have?
[EX A]: 23.0

[EX Q]: Joan found 72 seashells and 12 starfishes on the beach. She gaveAlyssa some of her seashells. She has 28 seashell. How manyseashells did she give to Alyssa?
[EX A]:
44.0