exam Maths Puzzle Numerical Ability

I want to know the volume contained in the sphere up to height of 86 cm from bottom (sphere Inside diameter is 19000 mm)

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exam Other Question
make x the subject y^2=(8x+2)^2/(4x+2) Express the sum 1x2 + 2x3 + 3x4 + 4x5 + ... + 10x11 in summation notation.