exam Maths Puzzle Numerical Ability

A woman has an estate of $10,000. She leaves 2/5 to a charity. Of the remainder, 2/3 goes to her son. How much does her son get?

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exam Other Question

Write an algebraic equation for the english statement "subtract 5 from the sum of x and 7 times and the result is 20 If x = 3i is a root of the polynomial P(x) which has real coefficients, then what other root is guaranteed?