A hall 36m long and 15m broad is to be paved with stones, each measuring 3dm by 5 dm. The number of stones required is:	Choose the correct answer:
A) 3600
B) 1800
C) 18
D) 18000
E) 1.8

Rationale: "area of the hall = 3600 * 1500 area of each stone = ( 30 * 50 ) therefore , number of stones = ( 3600 * 1500 / 30 * 50 ) = 3600 answer : a"
Answer: A