book Maths Puzzle Numerical Ability

Solve [x-3]=7

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book Other Question

The difference between two numbers is 12. If 2 is added to seven times the smaller number, the result is the same as if 2 is subtracted from three times the larger number. Find the numbers. If you're the frugal type and never pay more for something than it's worth, would you pay $0.50 for a cup of coffee valued at i^i (that's i to the i power)?