book Maths Puzzle Numerical Ability

Solve the system
3x+2y=12
2y-5z=1
x+y+z=6

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book Other Question

square root of 300x15y25= Please help me with this problem. It has been over 38 years since I've been in school!

Bessie has 6 times as much money as Bob, but when each earns $6, Bessy will have 3 times