There are 30 students and twenty percent of students got an a. how many got an a?

Base is given which (total number of students) is 30
Rate is given which is 20%or 0.20                                                                        

We are looking for the percentage so, the formula that we will be using is :

P=B×R

P=30×0.20

P=6

entering that problem on the tube might get you an answer

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have