Guanghui Garment Factory processed 160 sets of garments in 4 days. According to this calculation, how many days does it take to produce 360 sets of clothes?
Suppose it takes x days to produce 360 sets of clothes, then:
360:x= 160:4，
160x=360×4，
x = 9；
A: It takes 9 days to produce 360 sets of clothes.