A water drum in the shape of a frustum, with end radii 24 cm and 18 cm and a depth of 21 cm, is filled to the brim. Then 40% of the water is used. How many cm³ remain? (Take \π = 22/7 .)

Question

Accepted Answer

17582.4. V = 1/3 × 22/7 × 21 × (576 + 324 + 432) = 22 × 1332 = 29304 cm³. What remains is 60%: 0.6 × 29304 = 17582.4 cm³. 29304 is the full drum; 11721.6 is the 40% that was USED, not what remains; 52747.2 forgets the 1/3 before taking 60%.

A water drum in the shape of a frustum, with end radii 24 cm and 18 cm and a depth of 21 cm, is filled to the brim. Then 40% of the water is used. How many $cm^{3}$ remain? (Take $π = \frac{22}{7} .$ )

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More Class 10 Frustum of a Cone practice

A water drum in the shape of a frustum, with end radii 24 cm and 18 cm and a depth of 21 cm, is filled to the brim. Then 40% of the water is used. How many cm3 remain? (Take π=722​.)

Step-by-Step Solution

Master this chapter in 30 minutes a day.

More Class 10 Frustum of a Cone practice

A water drum in the shape of a frustum, with end radii 24 cm and 18 cm and a depth of 21 cm, is filled to the brim. Then 40% of the water is used. How many $cm^{3}$ remain? (Take $π = \frac{22}{7} .$ )