book Maths Puzzle Numerical Ability

Solve the following system by substitution
8x-4=16
y=2x-4

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book Other Question

Suppose you have a calculator that has only the operation of division along with the ten numerals, an equal sign, and memory.
Explain how you could find 0.5% of 5600. (note: there are no decimal or multiplication operators)
Two questions:
First one:

The people living on Elm Street all decide to buy new hose numbers. So, they line up in a store in the order of their addresses: (which convenienttly