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
Graph the equation and identify the y intercept

x+5y=10

Would this be 5? if one third of a number is 6 less than half of the number, what is the number?