AMC 10A 2010 Problem 11

Past Contests AMC 10 AMC 10A - 2010
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1

The length of the interval of solutions of the inequality a \leq 2 x+3 \leq b is 10 . What is b-a ?

Answer Choices
A. 6
B. 10
C. 15
D. 20
E. 30