document.write( "Question 877274: 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 have 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? \r
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Algebra.Com's Answer #529270 by richwmiller(17219) $\"\"$ $\"About$

You can put this solution on YOUR website!
venn diagram
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