What does the attendance need to be on Saturday to have an average attendance for the week of 30 people per day?

Question

The table shows the attendance at the art show for the past week.  

 

 

Art Show Attendance
Day	Attendance
Sunday	54
Monday	29
Tuesday	22
Wednesday	28
Thursday	12
Friday	15
Saturday	?

What does the attendance need to be on Saturday to have an average attendance for the week of 30 people per day?
 

Answer 1

If we call the Saturday figure s, then (160+s)/7=30, where 160 is the sum for the rest of the week.

So 160+s=210 making s=50.

Answer 2

54+29+22+28+12+15+50=210 divided by 7=50