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

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

[A].

0

[B].

2

[C].

4

[D].

6

Answer: Option C

Explanation:

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.