If pq represents a positive two digit number, where p and q are single digit integers, which of the following cannot be true? Select:
A) p+q =9 B) (p)(q)=9 C) p-q = 9 D) q-p= 9 E) p/q = 9
(A) pq = 45 or 63 or 27   (B) pq = 33 or 19   (C) 90   (D) impossible   (E) pq = 91   (D) is impossible because 09 is not a valid two digit number --- if there's a zero in the ten's place, that's just 9, a single digit number. Therefore, no valid two digit number would satisfy (D).   ans q-p= 9
<result>D</result>
If pq represents a positive two digit number, where p and q are single digit integers, which of the following cannot be true?