exam Maths Puzzle Numerical Ability

What are the four odd digit numbers that have a sum of eight?

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exam Other Question

Suppose a chord of a circle is 24 inches long and is 9 inches from the center. Find the length of the radius. Ok, I've gotten so many examples about irregular square roots. But I still dont understnad it and how they get the answer.

Please help me solve this equation: {{{ √8 }}}.