The first two shipments of couscous added up to 7 + 13 = <<7+13=20>>20 pounds
Adding that weight to the next day’s shipment results in a total weight of 20 + 45 = <<20+45=65>>65 pounds
Since each dish takes 5 pounds, then the restaurant makes 65/5 = <<65/5=13>>13 dishes
#### 13