Question

A+b+c+d=?

d=2/5 din c
d=b-75
b=6/10 din c
a=2/3 din (b+d)

Answer 1

d=2/5*c => c=5/2*d
d=b-75 => b=d+75
b=6/10*c => 6/10*c=d+75
6/10*5/2*d-d=75
3/2*d-d=75
d(3/2-1)=75
d*1/2=75
d= 150
c=375
b=75
a=2*75=150
a+b+c+d=750