book Maths Puzzle Numerical Ability

The surface area of a cube is 50 cm squared.
what is the area of one face of the cube? What is the length of one edge of the cube? How do you find the answer?

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book Other Question
CAN SOMEONE TEACH ME HOW TO DO LINEAR INEQUALITIES?
like - how do i find a boundry of a line?
ex. y>x y=____ find 3 consecutive integers whose sum is 63