exam Maths Puzzle Numerical Ability

-3.3x + 2.7x = 5x - 12.7x

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exam Other Question

Please help me solve this problem: An aquarium charges a regular admission price of $15 and a junior admission price of $6. Three adults, a 4-year-old, and an 8-year-old, and a 12 Solve by completing the square
x^2+18x+80=0

Thank you