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All but 4 of the counselors at a certain summer camp have a sailing certification, first aid certification, or both. If twice as many of the counselors have neither certification as having both certifications, 7 of the counselors have a sailing certification, and there are a total of 22 counselors on staff, then how many of the counselors have a first aid certification?
A) 7
B) 9
C) 11
D) 13
E) 15
Answer: D
Source: Economist
A) 7
B) 9
C) 11
D) 13
E) 15
Answer: D
Source: Economist
