Lessons

General Aptitude
12.1 Surds and Indices - General Questions

11 / 15

Q.

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

View Answer

Correct choice: 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.

11 / 15