exam Maths Puzzle Numerical Ability

x+3y=9
-2x-6y=-18

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exam Other Question

The trench for a sewer pipe is to be in the shape of a rectangular solid measuring 165 ft. long, 10 inches deep along both sides, and 15 inches wide at the top and the bottom. how i AM HAVING PROBLEMS WITH THIS
Simplify
sqaure root7(9sqaure root2-3sqaure root7)

Thank you