Final answer:
Joseph can address 1.5 envelopes per minute. Cody can address 45 envelopes in half an hour. The correct option is d) 35 envelopes.
Step-by-step explanation:
To find out how many envelopes Cody can address in half an hour, we need to determine how many envelopes Joseph can address in one minute. We can do this by dividing the number of envelopes Joseph can address (27) by the time it takes him (18 minutes). So, Joseph can address 27/18 = 1.5 envelopes per minute.
In half an hour, there are 30 minutes. To find out how many envelopes Cody can address in half an hour, we can multiply the number of envelopes Joseph can address in one minute (1.5) by the number of minutes in half an hour (30). So, Cody can address 1.5 x 30 = 45 envelopes in half an hour.
Therefore, the correct option is d) 35 envelopes.