exam Maths Puzzle Numerical Ability

Simplify:

SQRT 500

I believe the answer is 250, is this correct? Thank you

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exam Other Question

hello,

how to solve by graphing:

2x - 3y = 12
3y - 2x = -12

thank you. 1. If x + a/x = b then find the value of (x^2 + bx + a)/(bx^2 - x^3)

2. If x + 1/x = 99, find the value of 100x/(3x^2 + 103x + 3)

Question from Tata Mc Graw-Hill NTSE book