book Maths Puzzle Numerical Ability

x-1/(x-5) = 4/(x-5)

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book Other Question

The petty-cash drawer of a small office contained $16.25. If there were twice as many nickels as quarters and as many dimes as nickels and quarters combined; how many coins of each type were there? I am having trouble with P=2w + 2L Here is what I did:
50= 2(1 + 1/3L)+2L =
50(3)=2(3) 1(3) 1/3(3) 2L(3)=
150= 6(3+L)+6L=
150= 18 +6L + 6L
150 - 18+ 12L
132= 12L
132/12=