If P + Q = 2R and R + S = 2P, then:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. P + R = Q + S.
Given
P + Q = 2R ------------- (I)
R + S = 2P ------------- (II)
From equation (I): Q = 2R - P
From equation (II): S = 2P - R
Q + S
Q + S = (2R - P) + (2P - R)
= 2R - P + 2P - R = R + P
Thus, P + R = Q + S