<PRE><B>Question 188912</B>
let x be the number of those graduating
:
.75x took 8 math course
:
remaining students would be .25x
:
so .6(.25x)=.15x
:
so .75x have taken 8 courses and .15x have take 6 or 7
:
what we have remaining is x-.75x-.15x=.1x
or 10% of the graduating class have taken fewer than 6 math courses</PRE>