12 percent of 72 is what number?

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

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?