exam Maths Puzzle Numerical Ability

Solve the system of equation:

3x+2y=11
2x-2y=4

Solve the system:

2x-y+2z=11
3x-2y-z=12
x-3y-z=1

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Find the accumulated value of an investment of $8000 at 8% compounded semiannually for 6 years. Round your answer to the nearest cent. Find the expected number of girls in a family of 7.