Overlapping Sets

All but $4$ of the counselors on staff at a certain summer camp have sailing certification, first aid certification, or both. Twice as many counselors have neither certification as have both certifications, and $7$ counselors have sailing certification. If there are a total of $22$ counselors on staff, then how many of the counselors have first aid certification?

A. $9$
B. $13$
C. $15$
D. $22$
E. $23$

The OA is B

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