exam Maths Puzzle Numerical Ability

find fixed interest rate, if a principal of $5,000 invested for 4 years earns $900, how much interest will $6,000 invested for 3 years earn at the same interest rate?

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Could someone please take the time to help me solve the question: Solve the following system of three linear equations: x - 2y = 4 and 2 x - 3 y + 2 z =
- 2 and 4 x - 7 y + 2 z =
I have a couple quick questions.

1.)Divide (30b^3+20b^2+25b+41)/(5b+5)

2.)Subtract and simplify (7-x/x-6)-(7x-9/6-x)
I got 6x-2/x-6 is theis correct or does it simplify even