36 people attended Quintero's Super Bowl party.
Total number of people = 36
Each person cheered for either the Patriots or the Rams.
Number of people cheered for Patriots + number of people cheered for Rams = 36
If 15 people were rooting for the Patriots.
Number of people rooting for patriots = 15
Number of people rooting for rams = f
Substitute the value:
Number of people cheered for Patriots + number of people cheered for Rams = 36
15 + f = 36
The equation which is used to find the number of people cheered for Rams is
15 + f = 36
Answer : B) 15 + f = 36