exam Maths Puzzle Numerical Ability

1/x + 1/y = -1,
x^3 + y^3 = 4,

solve the equations

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exam Other Question

Please help with: five times a number, subtracted from ten, is triple the number. Find the number How do I express his product in the simplest form?

a(squared)-b(squared) over a(to the fourth power)b times ab(b is squared) over 3a+3b