IS IT POSSIBLE TO ANSWER THIS? The vertex angle of an isosceles triangle is 10 less than three times the base angles. Find each angle of the triangle.

It's not accompanied by any other text or pictures. Am I just being stupid or is this an error on the teachers part?

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.