If 2x + 4y + 6z = 1 and 3x + 2y + z = 2.5 then x - z = ?
(A) 0
(B) 1
(C) 2
(D) 2/5
(E) cannot be determined
If x = -1 then find the value of 
(A) 
(B) 
(C) 
(D) 1
(E) None of the above
D, E and F are midpoints of sides AB, BC and AC of triangle ABC. Hence
is
(A) 1/4
(B) 1/3
(C) 3/4
(D) 2/3
(E) 1/2
What is the perimeter of a square in cms. if its area is 625 square cms. ?
(A) 25 cms.
(B) 50 cms.
(C) 75 cms.
(D) 100 cms.
(E) 125 cms.