Question

a restaurant sells a coffee refill mug for $6.75. Each refill costs $1.25. Last month keith spent $31.75 on a mug and refills write a equation to find the number of refills keith bought

Answer 1

y= 1.25x+6.75
Make 31.75 y because that is the total cost he paid.
1.25x+6.75=31.75
1.25x=25
x=20
So he had 20 refills. 

Answer 2

Answer

Find out the number of refills keith bought and write equation for it .

To prove

Let us assume that the number of refills be x .

a restaurant sells a coffee refill mug for $6.75.

Each refill costs $1.25

Last month keith spent $31.75 on a mug and refills .

Than the equation becomes

6.75 + 1.25 × x = 31.75

6.75 + 1.25x = 31.75

1.25x = 31.75 - 6.75

1.25x = 25

$x = \frac{25}{1.25}$

x = 20

Therefore the  number of refills keith bought be 20 .