On Tuesday the restaurant sells 40+40 = <<40+40=80>>80 dinners.
On Wednesday the restaurant sells 80/2 = <<80/2=40>>40 dinners.
On Thursday the restaurant sells 40+3 = <<40+3=43>>43 dinners.
In those 4 days, the restaurant sells a total of 40+80+40+43 = <<40+80+40+43=203>>203 dinners.
#### 203