Quincy was stuck inside during an afternoon rainstorm. He spent
20
2020 minutes reading books,
18
1818 minutes eating lunch,
12
1212 minutes watching TV, and
10
1010 minutes drawing.
For every
10
1010 minutes Quincy was inside he spent
3
33 minutes
_
_
_
_
\_, \_, \_, \_.

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

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.

Ithink i know it but i want to be sure so can you me out ?