A well with 14 m inside diameter is dug 8 m deep. The earth taken out of it has been evenly spread all around it to a width of 21 m to form an embankment. Find the height of the embankment.
How many cubic feet of earth are removed... ...to make a hole 4 feet wide by 7 feet long by 2 feet deep?
Consider a well of 116 meter depth and a frog at the bottom of the well. It climbs 9 meter in day time and slides down 5 meter during night. How many days it needs to climb out of the well?
