Question 259785
.75 c
.20 a
.05 others
.
Let a=number of A's
a/(a+22)=.2/.75 Proportion
a=.2(a+22)/.75
=(.2a+4.4)/.75
a=2a/7.5 + 44//7.5
7.5a=2a+44
5.5a=44
a=8
c=30
Let x=others
x/8=.05/.2
x=.4/.2=2
40 in class
.
Ed