“A 41 ft of tubing is to be cut into three pieces. If the longest piece is 5 ft less than twice the shortest piece, and the middle piece is 2 ft more than the shortest piece, find the length of each piece.” Trying to find what is the easiest way to solve this?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.