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Bunuel
At the beginning of each month, a certain book club offers its members the opportunity to purchase one or more books at a discount. At the beginning of January, the number of book club members who elected to purchase both The Brothers Karamazov and Pride and Prejudice was equal to the number of members who elected to purchase neither of those books. How many members were in the book club at the beginning of January?

(1) 128 book club members purchased The Brothers Karamazov and 212 book club members purchased Pride and Prejudice.

(2) Exactly half of the book club members who purchased The Brothers Karamazov also purchased Pride and Prejudice.

This is a Data Sufficiency Butler Question

Check the links to other Butler Projects:


­
Let the books be B and P
Both P and B = Neither P nor B = n (say)

S1: B = 128, P = 212
=> Total = (B + P - both) + neither = 128 + 212 - n + n = 340 - Sufficient

S2: There is no information regariding the number of people purchasing any of the books - Not sufficient

Ans A
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