IBPS Government Jobs Exams Numerical Ability Algebra

if 2^(2x-1) = 8^(3-x), then the value of x is:
(1) -1
(2) -2
(3) 2
(4) 3

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IBPS Other Question

Three years ago the average age of A and B was 18 years. While C joining them now, the average becomes 22 years. How old (in years) is C now?
(1) 24
(2) 27
(3) 28
(4) 30
On a Rs. 10, 000 payment order, a person has choice between 3 successive discounts of 10%, 10% and 30% and 3 successive discounts of 40%, 5% and 5%. By choosing the better one he can save (in Rupees):
(1) 200
(2) 255
(3) 400
(4) 433