<p>This is taken from Gruber's SAT Math Workbook.
The answer key says E, but couldn't A also be the answer?</p>
<p><a href="http://i.imgur.com/78ULo.jpg%5B/url%5D">http://i.imgur.com/78ULo.jpg</a></p>
<p>No, it’s just tricky wording.</p>
<p>9 and 12 divide Q… (Q is divisible by 9 and 12)
…which must Q divide? (what number is divisible by Q?)</p>
<p>The answer is (E) since Q could be arbitrarily large, so there’s no guarantee any of the numbers would be divisible by it.</p>
<p>Yeah the wording really got me. They should have just used “divisible”…</p>