exam Maths Puzzle Numerical Ability

In triangle CDE, CD=3y, DE=30, and CE=45. Determine the range possible values for y

I think the answer is 5 < y < 25

is this correct?

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exam Other Question
20 triangles measuring 3 x 6 assemble into a square Find all positive values for k for which each of the following can be factored.
x squared +x-k