The answer is 73, simple math
Let's Just See How Many Times 30 Goes Into 180

Since 8 trash bags last 30 days, let's multiply

ANSWER
You'll Need 48 Trash Bags For 180 Days
4y - y + 7y
4y - y = 3y
3y + 7y = 10y
10y is your answer
hope this helps
Answer:30+15
Step-by-step explanation: