book Maths Puzzle Numerical Ability

solve the following systems of equations

2x + 4y + 6z = 2
x + 2z = 0
2x + 3y - z = -5

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Can you please help me with these 2 question?

1. At the end of the first year, an account earning 3% interest earns $126 in interest. How much money was deposited in the accoun 60% of what is 30?