exam Maths Puzzle Numerical Ability

If a small company produces both doll houses and sets of doll furniture. The doll houses take 3 hours of labor to produce, and the furniture sets take 8 hours. The labor availabl

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39. lnx+lnx^2=3
The answer is {e}, but hot did they get that?

41. logx+log(x-21)=2

The answer is {25}, but how did they get that? i know how to do linear combination, but i cannot get the right answer for this problem:
2x+y+52=2y+50
2x+y+52=x-3y+131

I need help finding x and y.

Thank you!