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Bunuel
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Bunuel
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let current hardcover and paperback book be h and p respectively.
As per question h+18=3p or h=3(p-6). Question asks if h>p ? yes/no.
(1) p<12
3(p-6)<18. i.e. h<18. NOT SUFFICIENT, since h is not necessarily smaller than p. p=11, h=15 and p=11 & h=7 both are possible cases.
(2) p>9
3(p-6)>9 i.e h>9. NOT SUFFICIENT, since p=10, h=12 and p=12, h=10 both are possible.

Both together which gives 9<p<12 and 9<h<18. NOT SUFFICIENT, since p=10, h=12 and p=11, h=10 possible.

IMO E
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Ha = Hardcover, Pa = Paperback
18+Ha = 3pa
6+Ha/3 = Pa
1) Pa<12, For Pa=11, Ha=15 works... But Pa=7, Ha = 3. NOT SUFFICIENT
2) Pa>9, For Pa = 10 Ha = 12.. All the values more than 9 works, SUFFICIENT.
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