book Maths Puzzle Numerical Ability

1. x+x-4+x-7=19

2. 3x+x-6=54

3. 40=2 (3x+4+x)

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book Other Question

what is the difference between discrete and continuos data? Suppose that the volume of a sphere is numerically equal to twice the surface area of the sphere. Find the length of a radius of the sphere.