If 5x + y = 15, 5y + z = 25 and 2z + x = 2, what is the value of x ? Options:
A) 2
B) 7
C) 9
D) 12
E) None of these
Explanation:   5x + y = 15 –-------I * 5   5y + z = 25 –------ II   2z + x = 2 -------- III   Subtract (I) and (II)   25x + 5y + 0 = 75   - 0 + 5y + z = 25   -------------------------------   25x + 0 – z = 50 ….......... IV   Multiply (IV)*2, we get 50x – 2z = 100   2dding (III) and (IV) we get,   50x – 2z = 100   + x + 2= 
<gadget id="calculator">+ 2</gadget>
<output>2</output>
2   ------------------------   51 x= 102   x = 2   The value of x = 2   2NSWER 2
<result>A</result>
If 5x + y = 15, 5y + z = 25 and 2z + x = 2, what is the value of x ?