Rj, this is the solution to question 19:
• 1st period class sold 60 calendars in total
,
• 2nd period class sold 123 calendars in total
We calculate the average per week, this way:
• 1st period class sold 60/4 = 15 calendars per week
,
• 2nd period class sold 123/4 = 30.75 calendars per week
In consequence the multiplication equation that represents this situation is:
15w + 30.75w = 183, where w is the number of weeks Mrs. Hawkins' classes sold calendars.
This is the solution to question 20:
We already know the average number of calendars that 1st and 2nd period classes sold per week. Now, let's calculate the average for 3nd 4th peiod classes, this way:
• 3rd period class sold 89 calendars in total
,
• 4th period class sold 126 calendars in total
Therefore, the average is:
• 3rd period class sold 89/4 = 22.25 calendars per week
,
• 4th period class sold 126/4 = 31.5 calendars per week
Summarizing, we have:
15 + 30.75 + 22.25 + 31.5 = 99.5 calendars was the average number sold by all her classes in a week.
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