exam Maths Puzzle Numerical Ability

Please help! The length of a rectangle plus its width is 40m. The area is 336 square meters. How long is the longest side of the triangle?

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JIM HAS GOTTEN SCORES OF 60 AND 97 ON HIS FIRST TWO TESTS. WHAT SCORE MUST HE GET ON HIS THIRD TEST TO KEEP AN AVERAGE OF 75 OR GRATER ? 7. Let f(x) = to x squared - 6x + 9 ,g(x) = x - 3 find the following.

a.(f+g)(x) b.(f-g)(x) c.(fg)(x) d. (f/g)(x) e.(fog)(x)
f.(f-g)(5) g.g{f(x)} h. f{f(-3)}