Given,
• the average person produces 50 pounds of recyclables every month
,
• they usually throw away twice that much garbage
This means, each person usually throw away 50 x 2 = 100 pounds of garbage per month.
Gavin's family consists of:
0. Mother
,
1. Father
,
2. Sister 1
,
3. Sister 2
,
4. Gavin, himself
So, that's 5 people. On average 100 pounds of garbage are thrown away per person. Thus, 5 people will throw away:

500 pounds of garbage PER MONTH
Per year it will be:
500 * 12 months = 6000 pounds per year
We want the answer in tons!
We know 2000 pounds = 1 ton, thus,
6000/2000 = 3 tons
Correct Answer
3 tons