Final answer:
To remove all the earth, 800 scoops will be needed.
Step-by-step explanation:
To calculate the number of scoops needed to remove all the earth, we divide the volume of earth to be removed by the volume of earth removed with each scoop. So, 120m³ ÷ 0.15m³/scoop = 800 scoops. Therefore, 800 scoops will be needed to remove all the earth.