19.
A tank contains 266 litres of water. A bucket has a capacity of 8 litres. How many
buckets full of water can be taken out from the tank to empty it completely?
20.
A square board has its side 3 cm. find the perimeter of square.
21.
Each side of a polygon is 8.1 cm in length. The perimeter of the polygon is 72.9 cm. Find the
number of sides of the polygon.
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