Question

Suppose that the amount of time it takes to build a highway varies directly with the length of the highway and inversely with the number of workers. Suppose also that it takes 100 workers 6 weeks to build 4 miles of highway. How many miles of highway could 160 workers build in 15 weeks?

Answer 1

Answer is 16 miles

First you calculate the amount 1 worker is worth per week then multiply it by 160 and 15 to recalculate the miles completed.