Question 77772
1200/X-1200/(X+8)=7.50
[1200(X+8)-1200X]/X(X+8)=7.50
(1200X+9600-1200X)/X^2+8X=7.50
7.5(X^2+8X)=9600
7.5X^2+60X-9600=0
(X-32)(7.5X+300)=0
X-32=0
X=32 ORIGINAL MEMBERS.
PROOF
1200/32-1200/40=7.5
37.5-30=7.5
7.5=7.5