In a day in shop 9 identical boxes with cookies were sold. Till a lunch sold 162 kg of cookies, and after a kg lunch-81. How many boxes of cookies were sold till a lunch? After a lunch?

161
1) 162+81=243 kg - cookies were only 2) 243:9=27 kg - cookies in one box of 3)162:27=6 boxes - 4)81:27=3 boxes were sold till a lunch - sold after a lunch
231
Answer add