Question

five real numbers r,a,b,c,d are such that
{(r-1)^(1/2)+2*(a-4)^(1/2)+3*(b-9)^(1/2)+4*(c-16)^(1/2)+5*(d-25)^(1/2)}=((r+a+b+c+d)/2)
Find the value of r+a+b+c+d=
a)55 b)210 c)not uniquely determined d)110