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
How do you know when an equation has infinitely
many solutions? Find LCM of m^2-4m-5 and m^2+8m+7.

Thanks