Post mathematic related questions here

[Vignesh B]

135 min.
I don't know if this question is really this easy. My experience with Maths tells me that, if it is too easy, then probably my answer is wrong.
Anyway, by applying pythagoras theorem, we can find the third route back to hive which comes to 50min. √(30² + 40²) = 50
Then by adding all the times taken, 30+5+40+10+50 = 135

 

[rst]

135 min.
I don't know if this question is really this easy. My experience with Maths tells me that, if it is too easy, then probably my answer is wrong.
Anyway, by applying pythagoras theorem, we can find the third route back to hive which comes to 50min. √(30² + 40²) = 50
Then by adding all the times taken, 30+5+40+10+50 = 135

I also think the same
But ans is "less than 1 hour"

 

[Vignesh B]

^^ Can you verify the answer from somewhere else also?
Because the total flying time of 40+30 min cannot be neglected by any means which itself amounts for more than an hour. :/

 

[axelzdly1]

How about ignoring the waiting time...? Then the answer will be < an hour

The question is 'How long was the bee away from its hive?' not 'How much time does the bee take to travel the whole distance?'

If a friend asks you 'How far is your home from the XY centre..?' , he meant the distance/time taken for him, or in general...not the time/distance taking for you to return home, during which you take several halts for buying stuff, looking at women.,

 

[rst]

^^ Can you verify the answer from somewhere else also?
Because the total flying time of 40+30 min cannot be neglected by any means which itself amounts for more than an hour. :/

I think, there is some problem in ans key
Answer is definitely 135 mins
It will be clear in a week time(when original result will out)

 

[rst]

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you can use following mathematic symbols(just do copy and paste)
£ ω ∴ ∂ Φ γ δ μ σ Є Ø Ω ∩ ≈ ≡ ≈ ≅ ≠ ≤ ≥ • ~ ± ∓ ∤ ◅∈ ∉ ⊆ ⊂ ∪ ⊥ ô ∫ Σ → ∞ Π Δ Ψ Γ ∮ ∇∂ √ °α β γ δ ε ζ η θ ι κ λ ν ξ ο π ρ σ τ υ φ χ ψ
x⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁿ
x₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₊ ₋

 

[Niilesh]

is it the 2nd option?

i used angle of incident = angle of reflection = 45°


so in the isocelecs triangle formed by joining the points of contact and cente of hemisphere the value of base = 2 * R/cos45° = R*2^ (1/2)

 

[rst]

is it the 2nd option?

i used angle of incident = angle of reflection = 45°


so in the isocelecs triangle formed by joining the points of contact and cente of hemisphere the value of base = 2 * R/cos45° = R*2^ (1/2)

Absolutely right

 

[rst]

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Plz explain your answer

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you can use following mathematic symbols(just do copy and paste)
£ ω ∴ ∂ Φ γ δ μ σ Є Ø Ω ∩ ≈ ≡ ≈ ≅ ≠ ≤ ≥ • ~ ± ∓ ∤ ◅∈ ∉ ⊆ ⊂ ∪ ⊥ ô ∫ Σ → ∞ Π Δ Ψ Γ ∮ ∇∂ √ °α β γ δ ε ζ η θ ι κ λ ν ξ ο π ρ σ τ υ φ χ ψ
x⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁿ
x₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₊ ₋

 

[rohanz]

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Plz explain your answer

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you can use following mathematic symbols(just do copy and paste)
£ ω ∴ ∂ Φ γ δ μ σ Є Ø Ω ∩ ≈ ≡ ≈ ≅ ≠ ≤ ≥ • ~ ± ∓ ∤ ◅∈ ∉ ⊆ ⊂ ∪ ⊥ ô ∫ Σ → ∞ Π Δ Ψ Γ ∮ ∇∂ √ °α β γ δ ε ζ η θ ι κ λ ν ξ ο π ρ σ τ υ φ χ ψ
x⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁿ
x₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₊ ₋

120 ants?

 

[rst]

120 ants?

May be possible.
I don't know the answer.
Can you explain your answer ??

 

[Niilesh]

Hmmm... that's a question of kinematics not of pure maths. But I have forgotten how to solve that kind of questions only thing i can remember is that we use relative motion in it. I think its time to take out my 11th notes......

 

[rst]

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you can use following mathematic symbols(just do copy and paste)
£ ω ∴ ∂ Φ γ δ μ σ Є Ø Ω ∩ ≈ ≡ ≈ ≅ ≠ ≤ ≥ • ~ ± ∓ ∤ ◅∈ ∉ ⊆ ⊂ ∪ ⊥ ô ∫ Σ → ∞ Π Δ Ψ Γ ∮ ∇∂ √ °α β γ δ ε ζ η θ ι κ λ ν ξ ο π ρ σ τ υ φ χ ψ
x⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁿ
x₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₊ ₋

 

[Niilesh]

^ 17.5
I think this expression would be enough for explanation -> (360/12) * 35/60 = 17.5

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you can use following mathematic symbols(just do copy and paste)
£ ω ∴ ∂ Φ γ δ μ σ Є Ø Ω ∩ ≈ ≡ ≈ ≅ ≠ ≤ ≥ • ~ ± ∓ ∤ ◅∈ ∉ ⊆ ⊂ ∪ ⊥ ô ∫ Σ → ∞ Π Δ Ψ Γ ∮ ∇∂ √ °α β γ δ ε ζ η θ ι κ λ ν ξ ο π ρ σ τ υ φ χ ψ
x⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁿ
x₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₊ ₋

IMO the question is wrong as length of ant is not given and length of a point is undefined also a line consists of infinite no. of points so already infinite no. of ants would be present on the line AB

BTW I got answer = 240 [((60*2)*2] with some assumptions

 

[Chaitanya]

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Spoiler

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Plz explain your answer

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you can use following mathematic symbols(just do copy and paste)
£ ω ∴ ∂ Φ γ δ μ σ Є Ø Ω ∩ ≈ ≡ ≈ ≅ ≠ ≤ ≥ • ~ ± ∓ ∤ ◅∈ ∉ ⊆ ⊂ ∪ ⊥ ô ∫ Σ → ∞ Π Δ Ψ Γ ∮ ∇∂ √ °α β γ δ ε ζ η θ ι κ λ ν ξ ο π ρ σ τ υ φ χ ψ
x⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁿ
x₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₊ ₋

Ans is 50 mins. (<1 hr)
explanation

no by pythagoras theorem 3 rd side is 50 meters so it means 50 min..

 

[Niilesh]

Ans is 50 mins. (<1 hr)
explanation
View attachment 11193
no by pythagoras theorem 3 rd side is 50 meters so it means 50 min..

Actually its a problem of language.... When he said long we understood the usual meaning(for how much time he was away) but he actually(probably) asked how much far away he was(in min.)

 

[rst]

^ 17.5
I think this expression would be enough for explanation -> (360/12) * 35/60 = 17.5

Ans and explanation are correct

^ 17.5



IMO the question is wrong as length of ant is not given and length of a point is undefined also a line consists of infinite no. of points so already infinite no. of ants would be present on the line AB

BTW I got answer = 240 [((60*2)*2] with some assumptions

Ans is correct
What are the assumptions ?

 

[rst]

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NEW OBJECTIVE QUESTION

*img849.imageshack.us/img849/2030/6ka.png

Plz explain your answer

(Also you can ask your mathematics related questions or queries
we will try to solve them)
----------------------------------------------------------------------------------------------------------------------
you can use following mathematic symbols(just do copy and paste)
£ ω ∴ ∂ Φ γ δ μ σ Є Ø Ω ∩ ≈ ≡ ≈ ≅ ≠ ≤ ≥ • ~ ± ∓ ∤ ◅∈ ∉ ⊆ ⊂ ∪ ⊥ ô ∫ Σ → ∞ Π Δ Ψ Γ ∮ ∇∂ √ °α β γ δ ε ζ η θ ι κ λ ν ξ ο π ρ σ τ υ φ χ ψ
x⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁿ
x₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₊ ₋

 

[Chaitanya]

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NEW OBJECTIVE QUESTION

*img849.imageshack.us/img849/2030/6ka.png

Plz explain your answer

(Also you can ask your mathematics related questions or queries
we will try to solve them)
----------------------------------------------------------------------------------------------------------------------
you can use following mathematic symbols(just do copy and paste)
£ ω ∴ ∂ Φ γ δ μ σ Є Ø Ω ∩ ≈ ≡ ≈ ≅ ≠ ≤ ≥ • ~ ± ∓ ∤ ◅∈ ∉ ⊆ ⊂ ∪ ⊥ ô ∫ Σ → ∞ Π Δ Ψ Γ ∮ ∇∂ √ °α β γ δ ε ζ η θ ι κ λ ν ξ ο π ρ σ τ υ φ χ ψ
x⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁿ
₇ ₈ ₉ ₊ ₋

Ans : 20

1 term for each of x1.. x20

 

[rst]

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NEW OBJECTIVE QUESTION

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Plz explain your answer

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----------------------------------------------------------------------------------------------------------------------
you can use following mathematic symbols(just do copy and paste)
£ ω ∴ ∂ Φ γ δ μ σ Є Ø Ω ∩ ≈ ≡ ≈ ≅ ≠ ≤ ≥ • ~ ± ∓ ∤ ◅∈ ∉ ⊆ ⊂ ∪ ⊥ ô ∫ Σ → ∞ Π Δ Ψ Γ ∮ ∇∂ √ °α β γ δ ε ζ η θ ι κ λ ν ξ ο π ρ σ τ υ φ χ ψ
x⁰ ¹ ² ³ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ⁺ ⁻ ⁿ
x₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ₊ ₋