exam Maths Puzzle Numerical Ability

x(.10)-[.12(10000-x)]=540

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exam Other Question

please help to solve

2x - y - z = -5

-2x + 2y - z = 5

x + 3y + z = 6 FIND THREE WHOLE NUMBERS THAT MAKE EACH NUMBER SENTENCE TRUE
15 + X > 18 X=