Question 905204
a+c=36,
5*a+10*c=220
a=36-c
5*(36-c)+10*c=220
180-5c+10*c=220
5*c=40
c=8
a=36-c
a=28 at 5 and  c=8 at 10
check
28+8=36
5*a+10*c=220
5*28+10*8=220
140+80=220
220=220
ok