15 liters of water are poured into an aquarium that`s 70cm long, 30cm wide, and 40cm high. How many cm will the water level in the aquarium rise due to this added water?

(1 liter = 1,000cm³)

If all of a roofing company`s 6 workers are required to staff 2 roofing crews, how many workers need to be added during the busy season so they can send 4 complete crews out on jobs?

After being dropped a ball always bounces back to 2/5 of the height of its previous bounce. After the first bounce it reaches a height of 110 inches. How high will it reach on bounce number 4?