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Surds and Indices - General Aptitude

Q1:

If 3(x - y) = 27 and 3(x + y) = 243, then x is equal to:

A 0

B 2

C 4

D 6

ANS:C - 4

3x - y = 27 = 33        x - y = 3 ....(i) 3x + y = 243 = 35        x + y = 5 ....(ii) On solving (i) and (ii), we get x = 4.