Question
A solid cylinder of radius 7 cm and height 10 cm is
melted and recast into small solid cones each of radius 3.5 cm and height 8 cm. Find how many such cones are formed.Solution
ATQ,
Volume of cylinder = πr²h = π × 7² × 10 = π × 49 × 10 = 490π cm³ Volume of one cone = (1/3)πr²h = (1/3)π × 3.5² × 8 = (1/3)π × 12.25 × 8 = (1/3)π × 98 = (98/3)π cm³ Number of cones = (Volume of cylinder) / (Volume of one cone) = 490π / ((98/3)π) = 490 × (3/98) = 5 × 3 = 15
49.96% of 861.34 + 2250% of 55.12 = ?
956.41 of 45.06% = ?
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
480 ÷ 10 + 18 % of 160 + ? * 9 = 60 * √36
(29.97%) of 9840 + ? + (45.17% of 1240) = (31.99% of 11750)
`sqrt(1297)` + 189.99 =?
1649.98 ÷ 15.48 × 8.12 = ? × 8.16
1959.09 + 33.94% of 6250.06 – ? = √10609.02 + √144.24
What approximate value will replace the question mark (?) in the following?
? =...
The interest received by investing Rs. 1200 for 2 years at compound interest of 20% p.a., compounded annually, was re-invested for 3 years at simple int...
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