exam Maths Puzzle Numerical Ability

Please help me solve this problem:

9. (10 pts) In a survey of 75 resorts, it was reported that:
34 provided refrigerators in the guest rooms
30 provided laundry services

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exam Other Question

Solve the system of equations.

2x + y = 0

x - 3y + z = 0

3x + y - z = 0
y=x+2
2x+y=11

Could someone please help me?