A hall 36m long and 15m broad is to be paved with stones, each measuring 2dm by 5 dm. The number of stones required is:
Answers: A) 180 B) 1800 C) 5400 D) 18000 E) 1.8

Rationale: area of the hall = 3600 * 1500 area of each stone = ( 20 * 50 ) therefore , number of stones = ( 3600 * 1500 / 20 * 50 ) = 5400 answer : c
Answer: C