Answer:
9
Step-by-step explanation:
9 × 9 = 81
81 + 40 = 121
121 is the amount of money you want so you just have to mow 9 lawns to get your exact amount of money you need.
click the 2nd 1
4 minutes
looks at the 8 gallon line and follow it over to the corresponding minute line
please edit your question man