Question
If W1 and W2 are weights of two solid iron balls of
radii ½ metre and 1/3 metre respectively, then which one of the following is equal to W1 : W2?Solution
Weight = Volume x Density Both balls are of same material, hence Weight ∝ Volume. Volume of ball = (4/3)πR³ R = Radius of the ball W ∝ (4/3)πR³ As (4/3)π are constant => W ∝ R³ => W₁ ∝ (1/2)³ => W₂ ∝ (1/3)³ => W₁ / W₂ = (1/2)³ / (1/3)³ => W₁ / W₂ = (3/2)³ => W₁ / W₂ = 27/8 => W₁ : W₂ = 27 : 8
18 * 9 + 25% of 120 + 50% of 200 = ?
Simplify the expression and find the value of 'x'
35% of 500 of 18 ÷ 21 = x
Simplify the following expressions and choose the correct option.
{ (15/2) * 16 } ÷ (5/2) + 9
82% of 400 + √(?) = 130% of 600 - 85% of 400
45% of 360 - 160 + ? = √324
25.6% of 250 + √? = 119
What will come in the place of question mark (?) in the given expression?
24% of 350 + 246 = ? + 50 × 2.5
Evaluate: 45 − {18 ÷ (3 × 2)} + 7
458.32 - 563.32 + 659.32 =?
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