Question
If the radius of the base and the height of a right
circular cone are increased by 10%, what is the approximate percentage increase in volume?Solution
Let the radius of the cone = x cm Height of the cone = y cm Volume of the cone = 1/3π r2h = 1/3πx2y After increment, Radius of the cone = 1.1x cm Height of the cone = 1.1y cm Volume of the cone = 1/3π × 1.1x × 1.1x × 1.1y = 1/3 π × 1.331x2 y Difference = 1/3 π × 1.331x2y - 1/3πx2y = 1/3π × 0.331x2y Required percentage = 1/3π × 0.331x2y/(1/3π × x2y) × 100 = 33.1%
40% of 50 + 50% of ? = 25% of 300 - 10% of 250
140% of 1270 + 60% of 2085 = 1881 + ‘?’% of 287
48 ÷ 6 × √25 + 13 × 8 = ?
- What will come in the place of question mark (?) in the given expression?
32% of 74% of ? = 16% of 37% of 180 Find the simplified of the following expression:
4.2 × 6.5 × 7.8 = ?
Train M, ‘x’ metres long crosses (x – 30) metres long platform in 22 seconds while train N having the length (x + 30) metres crosses the same plat...
{(5/8) + (4/5)} × (?/19) = 33
What will come in place of (?) question mark in the following expression.
(√1296 ÷ √36) × ? = 120
(200 + 50% of 120) ÷ (9 × 2) = ?
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