exam Maths Puzzle Numerical Ability

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A chemist needs 900 millileters of a 40% acid solution for a chemistry experiment. The chemist combines x milliliters of a 20% acid solution and y m

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exam Other Question

If a rectangular solid (4x5x7) is inscribed in a sphere, what is the radius of the sphere? (Is the diameter the diagonal of the rectangular solid? I know it would be if the rectangular solid were a cube.) If so, I got the radius to be 4.7434. The kinetic energy of a particle of mass m is found by taking one half of the product of the mass (m) and the square of the velocity (v). Write an expression for the kinetic energy of a particle.