exam Maths Puzzle Numerical Ability

One eighth of the square root of 7 less than a number is 2. What is the number?
I also need the proof for it.
Please and Thank You=)

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exam Other Question

You are in a cave with 5 green- or blue-eyed people who can see in the dark. Green-eyed people always tell the truth; blue-eyed people always lie. A says: "I see three pairs of gre Solve the system of equations by graphing using these 2 equations y=10x+25 and y=15x+10