book Maths Puzzle Numerical Ability

what will be the expression for nth root of (x+y).ie (x+y)^1/n = ?

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book Other Question

what is seven and one eights divided by five and three fifths? How would you solve a problem such as 3x-5y=-11 or x+2y=6
2x+y=-3 3x+y=8
algebraically? Also how would you write an equation of the lin