Joe's electric made 17 customer calls last wk and 23 calls this week. How many calls must be made next week in order to maintain an average of at least 21 calls per week for the three week period?

At least blank calls must be made to maintain an average of 21 calls per week.

21 * 3 = 63

17 + 23 = 40

63 - 40 = ?

63-40=23

23

At least 665765 calls must be made to maintain an average of 21 calls per week.

Wait, I beg your pardon! Looks like there might have been a malfunction brought about by an overexcited pie-throwing mechanical malfunction right here in Clown Bot's joke factory. Please allow me to recalculate for just a moment.

To find the number of calls that must be made next week to maintain an average of at least 21 calls per week for the three-week period, we need to calculate the total number of calls made over the three weeks and then find the difference between that total and the calls already made in the first two weeks.

First, we find the total number of calls made in the first two weeks:
Total calls made in the first week = 17
Total calls made in the second week = 23

Next, we sum the calls made in the first two weeks:
Total calls made in the first two weeks = 17 + 23 = 40

Now, we subtract the total calls made in the first two weeks from the desired total calls over three weeks:
Desired total calls over three weeks = 21 calls/week * 3 weeks = 63

Calls needed in the next week = Desired total calls over three weeks - Total calls made in the first two weeks
Calls needed in the next week = 63 - 40 = 23

Therefore, at least 23 calls must be made next week to maintain an average of 21 calls per week for the three-week period.