Jerry had 45 tickets for games at a carnival. he used 1/3 of the tickets to play ball-toss game. He used 2/5 of the tickets to play the ring -toss game, he saved the rest for the following day. How many tickets did jerry have after playing these games? A:19
B:12
C:21
D:18

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.