Answer:
1395 times.
Step-by-step explanation:
The Williams family open their door 28 + 17 = 45 times a day.
So in October they opened it 31 * 45 = 1395 times.
This is true
You are division by 12/6 by 3 and that =4/2
7(4 + 5) = 63
28 + 35 fits the criteria for your question.
5.45