book Maths Puzzle Numerical Ability

Solve each equation:

1. n - (8 + 4n) = 2(3n - 4)

2. 2z - 3 4 - z z + 1
------ - ----- = -------
4 2 3

3. 40x - 5 5 33 - 2x

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book Other Question

3(r+1)-[2(3-2r)-3(3-r)]=2(r+5)-4 Please help me solve the following word problem. I am confused about what formula to use.

It costs $57.20 to frame a rectangular painting with a flat aluminum strip. This was c