exam Maths Puzzle Numerical Ability

Express10/3-5/2 as a simplified rational number.

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exam Other Question

4square root 6 * 2square root 20 Use Gaussian elimination with backward substitution to solve the system of linear equations. Write the solution as an ordered pair or ordered triple, whenever possible.
x+2y+z=3
x+y-z=3
-x-2y+z=-5