book Maths Puzzle Numerical Ability

Three times the mystery number was increased by 100, and the result was 12 less than the number. What is the mystery number?

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THE STONES plans to receive $270,000 next year from a certain investment, with increases of 9% per year. If N = 5 years and the interest rate is 3%, determine the present worth of How do you find the discriminant for the polynomial 3x^2+13x-10