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Surds and Indices - General Aptitude

Q1:

If a x - 1 = b x - 3 , then the value of x is:
b a

A
1
2

B 1

C 2

D
7
2

ANS:C - 2

Given  a x - 1 = b x - 3
b a
a x - 1 = a -(x - 3)  =  a (3 - x)
b b b
 x - 1 = 3 - x  2x = 4  x = 2.