book Maths Puzzle Numerical Ability

Can someone please answer the question 2700, that is already on your site.

Thank yuou very much!

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book Other Question

f(x)= log x

I dont even know how to begin.
Please help, we are lost again, and specially on doing the graph. There is no book for this question, it is from the teacher. Thank you in advance for any and all help.

2) The v