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.

A worker at a medical lab is studying blood samples. 2 samplescontained a total of 7341 blood cells. The first sample contained 4221blood cells. How many blood cells were in the second sample?
3120.0