Question

a cubical water tank with lid and each outer edge 3.5m long is to be built. the oiter surface of the tank excluding the base and top is covered with square tiles of side 35cm long. find the number of tiles required

Answer 1

area of cubical tank= area of cubical tank - area of base of tank=
$(6 \times 3.5 {}^{2}) - 3.5 {}^{2} = 12.25m {}^{2} = 122500cm {}^{2}$
area of tile= 35*35=1225cm^2
number of tiles required= area of tank/area of tile=122500/1225=100
so 100 tiles will be required