Question 757532
Consider the width of the room - 10m
Only 10 pipes of 1m diameter can be
laid side by side.
Consider the height - 10m
Only 10 pipes of 1m diameter can be 
stacked side by side.
Therefore the total number of pipes
that can be placed in this room = 
10 x 10 = 100 pipes of 10m length.
Hope this helps.
:-)