exam Maths Puzzle Numerical Ability

3. A group can charter an aircraft at a fixed total cost. If 36 ppl charter the aircraft rather than 40, then the cost per person is greater by $12. What is the cost per person if 40 people charter the aircraft?

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how do i solve for x in this problem:
3=1/4 square root of 3x + 30? Find theta to four significant digits for 0< or= to 2pi.
54) cos theta=-0.9135
56) sin theta=-0.0436
58) cot theta= 1.860
60) csc theta= 3.940