For a certain year, a ski resort averaged d dollars per week in receipts

for its 20-week season. If the resort was closed for w weeks during the
season because of lack of snow and earned no money during those
weeks, how much money did it earn per week, on the average, during
those weeks it was in operation?

total for 20-week season: 20d

if closed for w weeks, then it was only operating for 20-w weeks.

So, the average take per operating week was 20d/(20-w)

To find the average amount of money the ski resort earned per week during the weeks it was in operation, we need to exclude the weeks when they were closed due to lack of snow.

Let's break down the problem:

1. Find the total amount of money earned during the season: The ski resort averaged d dollars per week for a 20-week season, so the total amount of money earned during the season is d * 20.

2. Find the total number of weeks the resort was in operation: Since the resort was closed for w weeks due to lack of snow, the total number of weeks the resort was in operation is 20 - w.

3. Calculate the average amount of money earned per week during the weeks the resort was in operation: Divide the total amount of money earned during the season (d * 20) by the total number of weeks the resort was in operation (20 - w).

By following these steps, you should be able to determine the average amount of money the ski resort earned per week during the weeks it was in operation.