Incredibly difficult math question! Need help!

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<p>Could someone please provide an explanation? The answer is below:
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C: 27</p>

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<p>78 total - 7 in neither = 71 total clubbers. 56+42 = 98 total people in club either or both clubs… 98-71= 27, so there is a 27 overlap, so 27 are in both.</p>

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<p>that wasn’t very difficult…?
and I’m awful at math</p>

<p>draw a venn diagram if it helps</p>

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<p>You can also add up all the responses 42+56+7=105 and then subtract the number of participants 105-78 which gives you 27 people answering twice</p>

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<p>Bah, my mistake. Jeez, didn’t know it was that easy. Haha, thanks guys! :)</p>