exam Maths Puzzle Numerical Ability

How would I solve this for kj?:

ln(kj/15) = 2ln(kj/60)

The answer is kj = 240, but I am unsure as to how to get there. Thanks for your help.

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exam Other Question

I have this problem.

"Find the quotient and remainder of f(x)=x^3-4x^2+5x+5 divided by p(x)=x-1."

How do you solve this?
Solve each of the following systems by graphing. Examples you might want to review (in order) are: Example 3 (p 681), Example 1 (p 679) and Example 4 (pp 681-682).

3x - 6y = 9