Answer and Explanation:
The computation of the number of bottle of milk will the country at the end of the exchange is shown below:
The Number of milk bottles Japan is presently producing is 60 bottles
The Number of milk bottles Japan trades with another country is 30 bottles
So,
The Number of Milk bottles left with Japan after doing an exchange is
= 60 - 30
= 30 bottles
Also,
The Number of egg cartons Japan is presently producing is 12
The Number of egg cartons Japan trades with another country is 30
So,
Number of eggs cartons left with Japan after considering an exchange is
= 12 + 30
= 42 cartons