<p>if 4 bags of flour with an average weight 15 pounds are put onto a shelf with 4 5-pound bangs of flour, what is the average weight in pounds, of all 8 bags on the shelf?</p>
<p>The answer is D, 20. </p>
<p>Can anyone show me how this works?
It would be greatly appreciated.</p>
<p>Thanks.</p>
<p>that question sounds weirdly worded.</p>
<p>Um...are you sure it's 20 and not 10?</p>
<p>Hey I have the test too and the answer is 10 not 20...</p>
<p>New average = [15(4) + 4(5) ]/ 8 = 10</p>
<p>oh thanks, it says D (20) on my answer sheet from collegeboard.
(I thought it was 10 too)
Thank you all.</p>