A certain number of men can do a work in 45 days. If there were 12 men more it could be finished in 9 days less. How many men are originally there?(IBM COMPANY)

A certain number of men can do a work in 45 days. If there were 12 men

1.	A certain number of men can do a work in 45 days. If there were 12 men more it could be finished in 9 days less. How many men are originally there?(IBM COMPANY)
A.	83
B.	32
C.	48
D.	42
Answer» D. 42