Question

A restaurant earns $1445 on Friday and $1624 on Saturday. Write and solve an equation to find the amount xx (in dollars) the restaurant needs to earn on Sunday to average $1500 per day over the three-day period. Write your equation so that the units on each side of the equation are dollars per day.

Answer 1

Total earned Friday = $1445
Total earned Saturday = $1624
Earnings Sunday - $xxx

Average over 3 day period = $1500
Therefor total over 3 day = $1500 x 3 = $4500
So earnigs friday + Saturday = $1445 + $1624 = $3069
                                                   $4500 - $3069 = $1431 earned on Sunday

Answer 2

To get the equation we need to resort to the average formula.
The sum of numbers/amount of numbers.

(1445 + 1624 + x) / 3 = 1500
(3069 + x) / 3 = 1500
3069 + x = 4500

x = 1431

So, they would have to earn $1431 on Sunday in order to get the mean average of $1500.