18 cattle graze a field in 12 days. 6 cattle can graze 3 of such fields in x days. What is x?
A. 90
B. 72
C. 36
D. 108
A. 90
B. 72
C. 36
D. 108
A. 300
B. 200
C. 250
D. 350
A. 40
B. 50
C. 30
D. 56
A. 15
B. 12
C. 10
D. 20