Can someone tell me the equation you would use? this is the question: Sadia works at a theatre selling popcorn. Large boxes of popcorn sell

for $5.00 and small boxes of popcorn sell for $3.00. During her shift

last night, she sold 60 boxes of popcorn. Her receipts totalled $260,

not including taxes. Determine the number of large and small

popcorn boxes she sold last night.