Question

x+y/x+y+z = y+z/x+y+z = x+z/x+y+z =p then which of the following can be p (a) 1/2 (b) 2 (c)2/3 (d)3

Answer 1

(x+y/x+y+z)+(y+z/x+y+z)+(x+z/x+y+z)=p+p+p
or, x+y+y+z+x+z/x+y+z=3p
or, 2x+2y+2z/x+y+z=3p
or, 2(x+y+z)/x+y+z=3p
or, 2=3p
or, p=2/3
so, option c is the right answer.