Exam Maths Puzzle Numerical Ability

when a number is written in base b we have 12*25=333. what is the value of b?

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Exam Other Question

f(x) and g(x) are two functions defined as:
f(x) = 2x + 3 and g(x) = 3x + 7, then what is the value of g(f(5))?
Option
(a) 51
(b) 42
(c) 46
(d) 37
what is the 10th term in the series
3,6,7,12,13,18,19,24,?,?
a)31
b)32
c)33
d)34