Question 900373
a+b=240,
0.5*a+0.2*b=0.4*240
a=240-b
0.5*(240-b)+0.2*b=96
120-0.5b+0.2*b=96
-0.3*b=-24
b=80
a=240-b
a=160 at 50% b=80 at 20%
check
0.5*160+0.2*80=0.4*240
80+16=96
96=96
ok