is this 4 separate problems? If so, do them all the same way: just add up the quantities:
(a) 250+150 = 400
Find out how many bags of rice have been shipped in or shipped out within two days:
a) Day one, 250 bags have been shipped in; Day two, 150 bags have been shipped out.
b)Day one, 100 bags have been shipped out; Day two, 120 bags have been shipped out.
c)Day one, 180 bags have been shipped out; Day two, 140 bags have been shipped in.
d)Day one, 175 bags have been shipped in; Day two, 175 bags have been shipped in.
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