Question

A verandah is 40m long and 15m broad. It is to be paved with stones, each measuring 6dm by 5dm. Find the number of stones required.

Answer 1

as 10 dm =1m 
   so , 6dm=0.6m and 5 dm = 0.5m
now area of verandah={40*15}m^2
                                     =600m^2
and area of each stone ={0.6*0.5}m^2
                                     =0.3m^2
hence, no of stones req.=600/0.3
                                     =6000/3
                                           =2000 ans.