book Maths Puzzle Numerical Ability

On a chemistry test Mr. Wilson pays his daughter Carol $1.50 for every question that she answers correctly. Carol pays her father $1.00 for every question she answers incorrectly.

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2[3(-x2+x)-1]-5x+6x2 When the ancient Egyptians were building the great pyramids at Giza, they checked each cource or level of stones to make sure they were being laid square by measuring the diagonals