Joes electric made 19 customer calls last week and 24 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

Joes electric made 19 customer calls last week and 24  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?

Reiny · Answer

solve for x ... (19+24+x)/3 = 21