You need a 45% alcohol solution. on hand, you have a 350 ml of a 15% alcohol mixture. you also have 70% alcohol mixture. how much of the 70% mixture will you need to add to obtain the desired solution?
you will need
ml of the 70% solution

Sum is 17 and their difference is 3

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?

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.