exam Maths Puzzle Numerical Ability

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

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exam Other Question
Three times the mystery number was increased by 100, and the result was 12 less than the number. Find the mystery number. perform the following operation: v-w=?
where v=8i-6j and w=-2i+4j