Simplify using mental math 7 / 10 + 2 / 5 - 1 / 10

If f(x)= 3x+6 which of the following is the inverse of f(x)

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

3women sell hats at a craft fair weekly. the money they make at the fair is split into categories. 9% goes to pay taxes. $55 goes to pay rent for the space they sell in. the rest is split between the women. if the group make $706 at the fair, how much does each women get paid once the money is divided