Abag contains blue marbles and red marbles, 106 in total. the number of blue marbles is 6 more than 4 times the number of red marbles. how many blue marbles are there?

This size running track is usually called a 400 meter track. however if a person ran as close to the inside as possible on the track they would run less than 400 meters in one lap. how far away from the inside border would someone have to run to make one lap equal exactly 400 meters