Preston is making cookies. He has 4/5 cup of flour in a bag. He then used two 1/10 cup scoops of flour for his recipe. Which of these best explains the amount of flour left in the bag?
6/10 because 4/5 2 x 1/10=4/5 - 3/10
5/10 because 4/5 - 2 x 1/10=4/5 - 2/10
6/10 because 4/5 - 2 x 1/10=4/5 - 2/10
5/10 becuase 3/4 - 2 x 1/8=3/4 - 3/8