exam Maths Puzzle Numerical Ability

How do you know when an equation has infinitely
many solutions?

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exam Other Question

simplify

the square root of 125
over the square rot of 5

i get 5 square root of 5 is this correct?
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?