2020 · Q89
The radii of the flat circular faces of a bucket are x and 2x. If the height of the bucket is 3x, what is the capacity of the bucket? (Assume π = 22/7)
Elementary MathematicsMensuration
- A11x³
- B22x³
- C44x³
- D55x³
Explanation
Frustum volume = (pi*3x/3)(4x^2+2x^2+x^2) = 7*pi*x^3 = 22x^3 with pi = 22/7. Hence option (B). With x = 1: volume = (pi/3)*3*7 = 7*pi = 22 using pi = 22/7.