Question
Volume of material used in constructing a hollow
cylinder of height 24 cm and thickness 1 cm is 96Ï€. What is the sum of the internal and external radii?Solution
Let external and internal radius of the cylinder be R and r cm respectively. Thickness of cylinder (R - r) = 1 cm. Height of the radius h = 24 cm As we know, Volume of hollow cylinder = π (R2 – r²) h π (R2 – r²) h = 96π  π (R + r) (R - r) h = 96π  (R+ r) x 1 x 24 = 96  (R+ r) = 96/24  (R + r) = 4 cm
The income of a person is Rs.15000 and his expenditure is Rs.12000. In the next year his income and expenditure is increased by 8% and 13% respectively....
What will come in the place of question mark (?) in the given expression?
(9/...
[√441 ÷7] × 40% of ? = 500 – 12.5% of 400
16 × 35 + 119 + 23 × 17 = ? + 370
√ (122 + ? + 65) = 14
- What will come in place of the question mark (?) in the following questions?
180÷3×2+6=? ((12+12+12+12)÷4)/((8+8+8+8+8+8)÷16) = ?
- What will come in place of (?) in the given expression.
(25% of 320) + (15% of 240) = ? 23% of 8040+ 42% of 545 = ?%of 3000
`(21 xx 51 + 54)/(9 xx 14 - 30 )` =?
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