1. (a) The work done by (x − 3) men in (2x + 1) days and the work done by (2x + 1) men in (x + 4) days are in the ratio of 3 : 10. Find the value of x.   2. (b) If f (x) = 2x − 5 / 4x + 1, find:- (i) f (3)   3. (b) If f (x) = 2x − 5 / 4x + 1, find:- (ii) f (x2)