Q:Robert purchased $3500 worth of US saving bonds. If bonds are sold in $50 or $100 denominations only, which of the following CANNOT be the number of US saving bonds that Robert purchased?	Select:	A) 20	B) 27	C) 50	D) 70	E) 80
I started off with looking at the answer choices... 20-27-50 are in a tight range, so my guess was to look and rule out the bigger numbers.   The total amount is $3500. So with 80 bonds, each $50 = $4000 , we already exceed the $3500 limit. Hence 80 is the answer.
<result>E</result>
Q:Robert purchased $3500 worth of US saving bonds. If bonds are sold in $50 or $100 denominations only, which of the following CANNOT be the number of US saving bonds that Robert purchased?