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  1. If x + y = 2z then the value of  
    x
    		 +
    z
    		   is
    x − zy − z
    1. 1
    2. 3
    3. 1
      2
    4. 2
Correct Option: A

x + y = 2z
⇒  x = 2z – y
⇒  x – z = 2z – y – z = z – y

∴ 
x
 +
z
x − zy − z

=
x
 −
z
x − zz − y

=
x
 −
z
=
x − z
 = 1
x − zx − zx − z


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