Sky bought $22.50 worth of paint supplies at a store that sells brushes for $1.50 each and tubes of paint for $2.50 each. Let b
represent the number of brushes bought and t
represent the number of tubes bought.

Which one of the following could not be true about the values of b
and t
?

b=0
and t=9

b=6
and t=5

b=10
and t=3

b=15
and t=0