Question

there are 75 students in school band 45 students play woodwind instruments what percent of students play woodwinds

Answer 1

45/75 play woodwind
that simplified is 3/5

Answer 2

So here is what we know
75 students are in the band
45 play woodwinds
Now let me make an expression(I use this usually)
part/whole=%/100
So we know the part is 45 and the whole is 75, and we don't know the %
So let us substitute those values...
45/75=%/100
Lets simplify 45/75
45/75 divided by 15/15= 3/5
So lets get back to our expression
3/5=%/100
5 x 20 is 100 so 3 x 20 is 60 
So 60% of the students is the correct answer