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?

Question

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

Answer 1

21 * 3 = 63

17 + 23 = 40

63 - 40 = ?

Answer 2

63-40=23

Answer 3

23