exam Maths Puzzle Numerical Ability

x-y=5; x+y=3

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exam Other Question

find 2 solutions for "n"

14n^2=25n+25
which leads to.. 14n^2-25n-25=0
help pleasee 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?