Madeline hosted a dinner party at her favorite restaurant. she had to pay 15 pet guest. the restaurant took $60 off the bill due to a mistake in the order if the bill is 675 which equation will the restaurant determine the number of guests at the dinner party?
675=60g+$15
675=15g+$60
675=60g-15
675=15g-60

So the question states she is paying $15 per guest..
that would be 15g

The question also states that they took $60 off of their bill. 
that would be - 60 

And The question states the total bill due is 675 dollars. 
Soo that is = 675 

So lets put our findings all together. 
675 = 15g - 60 

And that's our answer! ^^

Good Luck! :)