Question

A restaurant earns $1240 on Friday and $921 on Saturday. Write and solve an equation to find the amount xx (in dollars) the restaurant needs to earn on Sunday to average $1000 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

Alright, to average 1000 per day over 3 days, we have 1000*3=3000 dollars. Since we already have 2 days, we do 3000-1240-921=839 

Answer 2

The restaurant needs to earn $839 on Sunday.

Explanation:

Consider the provided information.

Let $x needs to earn on Sunday, to average $1000 per day .

It is given that the average earn should be $1000

`Average=\frac{\text{Sum of observations}}{\text{Total number of observation}}`

`Average= (1240+921+x)/(3)`

`Average= (2161+x)/(3)`

The average should be $1000, so substitute 1000 for average and solve for x.

`(2161+x)/(3) =1000\\\\ 2161+x=3000\\\\x=3000-2161\\\\x=839`

Thus, the restaurant needs to earn $839 on Sunday.

The required equation is
`(1240+921+x)/(3)=1000`.