book Maths Puzzle Numerical Ability

Find x to 4 decimal places: 1n x- 41n 3 = 1n(5/x)

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book Other Question

Evaluate the following to 4 decimal places. tan3.75 radians
I put down...
tan3.75(pi)
15(pi)/(divided by)4=180/(pi)
tan675-(360)
tan45=-1.0000
but i got it wrong on my test, can you show me what i did wrong? The sum of a number and 4 times its reciprocal is 25 over 6...

equation is: X+4(1/X)+25/6... but how do I solve this?

Thank you!