A sandwich shop has 60 stores and 50% of the stores are in California. The rest of the stores are in Nevada. Part 1 out of 2 How many stores are in California and how many are in Nevada? There are stores in California and in Nevada. Next Need it Now!​

100/50=one over two which is half and half of sixty is thirty so therefore thirty stores are in California and thirty stores are in Nevada too

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this