A rectangular courtyard with length 3 m 90 cm and breadth 1 m 55 cm is to be paved with square stones of the same size. Find the least number of such stones required.

Ash-Waite is a comet that orbits around the sun once in 36 years, and Shell-Waters is a comet that orbits around the sun once in 252 years. The last time they were seen together in the sky was in 2005. In which year will they be next seen together in the sky ?

Shehan has to walk, cycle, take the bus and train to get to the college. Shehan first takes his cycle to travel ^@\dfrac { 9 } { 160 }^@ of the total distance to the bus stop. The bus takes him another ^@\dfrac { 43 } { 160 }^@ of the distance. Shehan then takes a train to travel ^@106.875^@ kilometers. And finally, he walks ^@\dfrac { 1 } { 20 }^@ from the station to his college.
What is the total distance from his house to the college^@?^@