Luzvimindo is practicing to participate in an upcoming marathon. He runs 8 km every day. What is the total distance he covered in the month of December?

A factory produces 249863 books every month. It sends 99486 books to the town market, 42795 books to markets in other states and 21113 to markets in other countries. How many books are left with the factory?

In a triangle, the third angle is two third of the second angle, and the second angle is three times the first angle. What is the value of the first angle?

Arnel and Isko competed in a 1 km race. Arnel completed the race in CXC seconds and Isko completed it in CCCXIX seconds. By how many seconds (in Roman numerals) was Arnel ahead of Isko?