Question

a rectangular hall is 16 metre long and 12 wide how many Marbles snaps of size 25 CM x 15 CM are needed to cover all the floor of the hall

Answer 1

Here, length =16m and breadth =12 m
Therefore,area of rectangular Hall =16×12=192 m^2
Dimensions if marble is given in cm and dimensions of rectangular Hall is in my so we change dimensions of Hall in cm=192×100=19200
Now,
Area of marbles =25×15=375cm^2
So,marbles needed to cover all the floor of the hall =19200/375=51.2