Answer:
180 calendars
Explanation:
Given that in one workday he can make 4 calendars
Nine weeks (working five days per week)
=> the total number of days he works is: 9*5 = 45 days
=> the total number of calendars he can make in nine weeks is:
the total number of days he works * the number of calendars he make in one day
= 45* 4 = 180 calendars
Hope it will find you well.