Terry and Ed start a lawn mowing business and purchase the mowers and equipment for $1,300.Thry charge $15 for each lawn and use $2 worth of gas for each job. How many lawns must Terry and Ed mow before breaking even?
Let x be the number of lawns they must mow before breaking even.
Their revenue per lawn is 15x dollars.
Their expenses per lawn are 2x dollars.
Their total expenses are 1300 + 2x dollars.
Breaking even means their revenue equals their expenses, so 15x = 1300 + 2x.
Subtracting 2x from both sides, we get 13x = 1300.
Dividing both sides by 13, we get x = 100.
Therefore, they must mow 100 lawns before breaking even. Answer: \boxed{100}.