Question 1159216
Please help me solve this problem.  School A and School B singers combine to equal 40 singers.  Altos make up 32.5% of the singers.  40% of School A singers are altos.  20% of School B singers are altos.  How many singers are there for School A and how many singers for School B
<pre>Let number of School B-singers, be B
Then number of School A-singers is, 40 - B
We then get: .2B + .4(40 - B) = 40(.325)
.2B + 16 - .4B = 13     
.2B - .4B = 13 - 16
- .2B = - 3
Number of School B-singers, or {{{highlight_green(matrix(1,5, B, "=", (- 3)/(- .2), "=", 15))}}}
You should now be able to find the number of School A-singers!