Sixty men can stitch 200 shirts in 30 days working 8 hours a day. In how many days can 45 men stitch 300 shirts working 6 hours a day?  Pick.
A) 33
B) 77
C) 33
D) 80
E) 12
We have M1 D1 H1 / W1 = M2 D2 H2 / W2 (Variation rule)   (60 * 30 * 8)/ 200 = (45 * D2 * 6) / 300   D2 = (60 * 30 * 8 * 300) / (200 * 45 * 6) =&gt; D2 = 80.   Answer:80
<result>D</result>
Sixty men can stitch 200 shirts in 30 days working 8 hours a day. In how many days can 45 men stitch 300 shirts working 6 hours a day?