Cindy took her five grandchildren to the movies, where she offered to buy all of them popcorn and candy. A popcorn bag costs $4.00, and a box of candy costs $2.50. Cindy ended up spending $35.00 and purchasing one more box of candy than bags of popcorn. Use a system of equations to model the situation above, and determine which of the following is a possible description of Cindy's purchase.

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.