A 8m 57cm pole was put in a pond to measure its depth. If 4m 66cm of pole remained outside water, then the depth of the pond is?

 Solution: Length of pole = 8m 57cm =

= (8+0.57)m = 8.57 m Pole remained outside = 4m 66cm =

= (4+0.66)m = 4.66 m Depth of pond = (8.57-4.66)m = 3.91m