book Maths Puzzle Numerical Ability

find all the nth root of -1

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book Other Question

A group of people gather around a lake. 1/6 of them are on the north shore, 3/4 of the rest are on the west shore, 1/5 of the remaining people are on the south shore, and there are Sorry if this is the wrong topic for this problem.

Solve the system by addition.

5x-3y=13
4x-3y=11