exam Maths Puzzle Numerical Ability

the problem is on pg 414 of chp 14 review questions
root (3x-2)-root(x+7)=1

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exam Other Question

Pls help me with this qn: One thousand cubes are arranged to form a large cube. All the surfaces of the large cubes are then painted. What fraction of the cubes are not painted at all? Solve the system of linear equations by the substitution method.
5x + 4 y = 14
15x � 2y = 7