book Maths Puzzle Numerical Ability

the perimeter of a rectangle is 120ft. the length of the rectangle is twice than the width. find the length and the width of the rectangle.

120=2L + 2W
120-2(2W +2)+2W
120=4W+4+2W
120=4W+2W+4
116=W-- LOST

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book Other Question

If N(t)=N(0)a^pi^t

How would you determine:
1) N(0)
2) pi

Thanks Hi there!

I have asked this question a few times today, but no response. Could someone please help me solve this problem?
I am having trouble finding the LCD(new denominator) a