exam Maths Puzzle Numerical Ability

Subtract. Express your answer in simplest form.

5x/20 - x/20

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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? I am doing my homework assignment and I come across this problem...
squareroot sign 28 + 4 squarroot sign 7 - 2 squareroot sign 24
I know I should be able to figure this out, but my brain is fried!!!