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Maths Puzzle
Numerical Ability
2x cubed - x squared - 18x+9 = 0
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book Other Question
x+9y+z=20
x+10-2z=18
3x+27y+2z=58
I'm stumped by this.
A collection of Quarters, Nickels, dimes and pennies are on a acounter.
The avergae value of the coins on the counter is 20 cents. If a another Quarte