What is the first step to solving this?

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

Construct the graph that models the given situation