Problem
2010 AMC 10A Problem 11
The length of the interval of solutions of the inequality a \le 2x + 3 \le b is 10. What is b - a?
\mathrm{(A)}\ 6 \qquad \mathrm{(B)}\ 10 \qquad \mathrm{(C)}\ 15 \qquad \mathrm{(D)}\ 20 \qquad \mathrm{(E)}\ 30
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