book Maths Puzzle Numerical Ability

how do you do problems like 8x-3=5(2x=1)

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if a piece of equipment is making 1 complete revolution every 15 seconds what is the rpm? (revolution per minute)? Members of the Computer Club were assessed equal amounts to raise $1200 to buy some software. When 8 new members joined, the per-member assessmetn was reduced by $7.50. What was th