book Maths Puzzle Numerical Ability

If 64 feet of rope weighs 20 pounds, how much will 80 feet of the same rope weights?

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book Other Question

How di I find the solution also sketch the graph.

5 - 2(x - 2) = 3x -5(x - 2) - 1
I need help solving:
5x+6/11-4x = 7/11+8/11