There are two teams I and II of workers at a bridge construction site. Each team consists of W workers. On a particular day, a worker was shifted from team I to team II, if the ratio of the amount of work done by team I in (W + 1) hours and by team II in (W + 2) hours is 10 : 12, respectively, then W is equal to:

There are two teams I and II of workers at a bridge construction site.

1.	There are two teams I and II of workers at a bridge construction site. Each team consists of W workers. On a particular day, a worker was shifted from team I to team II, if the ratio of the amount of work done by team I in (W + 1) hours and by team II in (W + 2) hours is 10 : 12, respectively, then W is equal to:
A.	24
B.	20
C.	16
D.	18
Answer» D. 18