Someone who knows math and can help me I would appreciate it

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Long division the problem is 40 ➗ 348 = ?

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days