posted by Beatrice .
If b books cost d dollars, then d books cost
A. b dollars
B. bd dollars
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