Question

My friend told me I got this wrong, so I decided to come here.

Answer 1

x...number of h for 12600 shirts

12600 : x = 1200 : 6

1200x = 12600*6

1200x = 75600

x = 63h

if they work for 9h/day, for them to make a 63h worth of shirts, they'll have to work 7 days