If 10 bulls can plough 20 identical fields in 3 days working 10 hours a day, then in how many days can 30 bulls plough 32 same identical fields working 8 hours a day?
A. 2
B. 8
C. 10
D. 12
M1*D1*W2 = M2*D2*W1
10*3*10*32 = 30*d*8*20
d = 2 days