Answer:
6 hot dog buns
Step-by-step explanation:
Total number of hot dog buns required by Joe = 18
Total number of hot dog buns with Joe at present = 12
Thus, Joe has lesser number of hot dog buns as required.
The number of hot dog buns required over and above 12 hot dog buns
= Hot dog buns required - Number of hot dog buns with Joe at present
=18 -12
= 6