Kayla's father throws Kayla a graduation party that costs $775. He pays the DJ $250, $75 for the cake, and $5 per party guest for food. How many people were at the party?

Answer:
90 people
Step-by-step explanation:
Total: $775
DJ: $250
Cake: $75
Unknown party guests each getting $5
Let the unknown be x
We can form an equation; DJ + Cake + x number of party guests = $775
250 + 75 + 5x = 775
325 + 5x = 775
Subtract 325 from both sides of the equals sign.
5x = 450
Make x the subject and divide both sides by 5
x = 90
There were 90 party guests.