exam Maths Puzzle Numerical Ability

if a digital clock is the only light in an otherwise totally dark room when will the room be the lightest and will the room be the darkest?

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exam Other Question
Why is the set of natural numbers an infinite set but the set of blades of grass outside your yard a finite set? Rational and Radical Expressions

3) Divide and simplify:

5x-7 ÷ 25x²-49
——————————————
5x² +27x+28
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