exam Maths Puzzle Numerical Ability

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

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exam Other Question

Express in simplest form with rationalized denominators: sqrt 7 - sqrt 5 / sqrt 5 + 3 sqrt 7 A small circle is internally tangent to a big circle and a secant of the large circle is tangent to the small circle. The diameter of the big circle is 10, and the diameter of the