Experience Level of U.S Teachers The circle graph below shows the percent of U.S. teachers...

Experience Level of U.S Teachers The circle graph below shows the percent of U.S. teachers with 0 − 3, 4 − 10, 11 − 20, and more than 21 years of teaching experience. In 2009, there were 6.2 million elementary and secondary teachers in the United States.

a) How many more teachers had 11 − 20 years of teaching experience than 0 − 3 years?

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b) How many more teachers had 4 − 10 years of teaching experience than 11 − 20 years?