Maths problem

Answer of 3) is C), because combination of two experienced and fresher work should be at least 30 units hence , experience worker = x and fresher = y. When solving the problem 5x + 3y = 30.                                     I can't understand your 4th question, i think you omitted to put the sign between 2n and 2, please rectify that , so I can think on that properly.

3.) (b) 5x + 3y ≥ 30

The word "Atlleast" means mininum this much ie maximum no limit therefore  5x + 3y should be greater  than or equal to 30.

i had rectified 4th problem