james delivered 450 circulars in 3 hours at this rate how many circulars can he deliver in 4 hours?
450 circulars / 3 hours = x circulars / 4 hours
150 circulars / 1 hour = x circulars / 4 hours
(150 circulars / 1 hour) * 4 hours = x circulars
600 circulars = x circulars
x = 600 circulars, delivered in 4 hours