31. In a graduating high school class of 532, 15% of the students will receive As and 55% of the students will receive Bs. If 53 students receive Ds and no one failed, what approximate percentage
of the students received Cs?
a. 10%
b. 20%
C. 30%
d. 40%

How would I go step by step to figure it out?

The data represents the semester exam scores of 8 students in a math course. {51,91,46,30,36,50,73,80} what is the five-number summary?

I'll give brainliest if you answer right : )

Michelle and julie work at a catering company. they need to bake 264 cookies for a birthday party that starts in a little over an hour and a half. each tube of cookie dough claims to make 36 cookies, but michelle eats about 1/5 of every tube and julie makes cookies that are 1.5 times as large as the recommended cookie size.it takes about 8 minutes to bake a container of cookies, but since julie's cookies are larger, they take 12 minutes to bake. a. how many tubes should each girl plan to bake? how long does each girl use the oven? b. explain your solution process what did you make? c. what assumptions did you make?