Find the missing length indicated. This one is difficult and I don’t understand it.

You are updating your garage and the only thing left to paint is your garage day. you're only going to paint the slide that faces the street. the garage door is 9 fert 8inches tall and 120 inches wide. you need to know the surface area of the side of the garage door to determine how much paint to buy. the hardware store sells paint by how much covers a square foot. what is the surface area you should report to the hardware store what is the answer

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

What is the lcm of 16 and 40 ? 24 and 40 ?