exam Maths Puzzle Numerical Ability

Solve the system.
3x - 6y = 12
x - 2y = 4

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exam Other Question

Simplify

(a^2b^0c)^0 one third of a number is 5 less than half of the same number. What is the number?
Once you figure the answer how would you show your work to check to make sure it is right?