math
posted by Beatrice .
If b books cost d dollars, then d books cost
A. b dollars
B. bd dollars
C. d^2/b
D. b^2/d
These are the worst questions. Its a SHSAT question

set it up as a units conversion problem.
b books = d dollars, so
b bk/d dol = 1
d dol/b bk = 1
That is, books go at the rate of b/d books/dollar, or d/b $/bk
Now, you want to convert d books to dollars. You can always multiply by 1, so do it to cancel the units you don't want.
d books * d dol/b books = d^2/b dol 
THANK YOU SOO MUCH STEVE
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