Question 1114164
x, size of class
(3/4)x : (1/5)x is ratio of C to A.


C : A  is  15 : 4.


{{{C/A=15/4}}}.


------------------------------------
Suppose 22 more students received C's than received A's.
------------------------------------


{{{C-A=22}}}
-
{{{15A=4C}}}
{{{15A=4(A+22)}}}
{{{15A=4A+88}}}
{{{11A=88}}}
{{{highlight(A=8)}}}-------Eight students earned A.



---------------------------------------
and one-fifth received an A.
---------------------------------------


{{{(1/5)x=8}}}

{{{highlight(x=40)}}}-----------class of 40 student size