A well with 28 m inside diameter is dug 16 m deep. The earth taken out of it has been evenly spred all around it to a width of 21 m to from an embankment. Find the height of the embankment 

How many iron rods, each of length 14 m and diameter 4 cm can be made out of 0.88 cubic metre of iron 

A circular wire of radius 35 cm is cut and bent in the form of a rectangle where sides are in the radio 2 : 3. The smaller side of rectangle is