Back to School Week - Monday: Maths! - Page 2 - Jesters&Heralds

Back to School Week - Monday: Maths!

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Ungoliant [6]

Forum Noob

Posts: 31

Monday, September 9th 2019, 4:21pm

Quoted from "Innos"

Using only addition, how do you add eight 8’s and get the number 1000

888 + 88 + 8 + 8 + 8 = 1000.

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Innos [13]

Professional

Posts: 897

Location: Pennsylvania

Monday, September 9th 2019, 4:23pm

Ungoliant is correct :smoke:

I don't have no fear of death. My only fear is coming back reincarnated.

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Ungoliant [6]

Forum Noob

Posts: 31

Monday, September 9th 2019, 4:41pm

I posted early, so I'm changing the question to avoid creating an unfair situation.

Imagine an Eagle named White sitting on his nest located on the roof of a train station. White is a very ambitious eagle, he claims he is the fastest bird to have ever existed, and to prove that he used to race trains on his free time.

But racing trains is simple! Now, he has a better challenge. He starts flying from his nest to a train that is moving toward the station, turns back just as he reaches the train's point closest to station, and starts flying back toward the station. After he reaches the station, he turns back once more and flies toward the train, then repeats the same procedure until the train reaches the station.

Ignore the length of White and assume he changes speed while turning back instantly.

So, if White starts flying with a velocity of 80km/h towards the train when the trains is exactly 100km away from the station, and the train has a velocity of 50km/h, how much distance will White fly in total?

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Innos [13]

Professional

Posts: 897

Location: Pennsylvania

Monday, September 9th 2019, 4:48pm

100km ?

I don't have no fear of death. My only fear is coming back reincarnated.

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Ungoliant [6]

Forum Noob

Posts: 31

Monday, September 9th 2019, 5:14pm

No right answers in 30 minutes, so I explain the solution.

So you can do some direct maths and try to solve an infinite series...

Or you can see that the train with 50km/h speed will travel the 100km road in 2 hours, and that is exactly the amount of time White will fly with a speed of 80km/h. 80km'h * 2h = 160km. (:

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zAquisgran [11]

Professional

Posts: 866

Location: Möhnesee

Monday, September 9th 2019, 5:15pm

Which 3 numbers give same result when multiplied or added?

so x+y+z = x*y*z

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Innos [13]

Professional

Posts: 897

Location: Pennsylvania

Monday, September 9th 2019, 5:18pm

1,2 and3

1+2+3=1*2*3

I don't have no fear of death. My only fear is coming back reincarnated.

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zAquisgran [11]

Professional

Posts: 866

Location: Möhnesee

Monday, September 9th 2019, 5:21pm

Quoted from "Innos"

1,2 and3

1+2+3=1*2*3

Correct Innos

Next Question to be posted at 15:45 :angel:

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Ungoliant [6]

Forum Noob

Posts: 31

Monday, September 9th 2019, 6:30pm

Quoted from "zAquisgran"

Which 3 numbers give same result when multiplied or added?

so x+y+z = x*y*z

There's also some general solutions to that.

I'm not sure whether these are all, but they work for sure:

1. x= -y and z=0. x+y+z = 0 = x*y*z

2. x=y=z=0.

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Hakan The Khan [20]

Master

Posts: 1,998

Location: Turkish Paradise

Occupation: Master of Satire

Monday, September 9th 2019, 6:40pm

There is a number, when you add it to its square and the digits of that summation added together bring it back to itself. What is this number?

It's better to be silent and be thought a fool than to speak and remove all doubt. What's even better is to weaponize your words to destroy anyone who dares challenge you.

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Hakan The Khan [20]

Master

Posts: 1,998

Location: Turkish Paradise

Occupation: Master of Satire

Monday, September 9th 2019, 7:08pm

Ok just a little hint: x*x+x=yz and y+z=x

(please note: yz is NOT y*z it's a two digit number like 95)

It's better to be silent and be thought a fool than to speak and remove all doubt. What's even better is to weaponize your words to destroy anyone who dares challenge you.

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Hakan The Khan [20]

Master

Posts: 1,998

Location: Turkish Paradise

Occupation: Master of Satire

Monday, September 9th 2019, 7:19pm

answer was 3

It's better to be silent and be thought a fool than to speak and remove all doubt. What's even better is to weaponize your words to destroy anyone who dares challenge you.

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-Bubba- [11]

Trainee

Posts: 92

Monday, September 9th 2019, 9:53pm

I cant see in the rules if it has to be the opposite race which ask the next question, but i think enough time has elapsed

question.

A man has 4 daughters. Each of his daughters has a brother. How many children does the man have?

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Lady Astra [16]

Trainee

Posts: 132

Monday, September 9th 2019, 10:01pm

5 - 4 girls and 1 boy

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-Bubba- [11]

Trainee

Posts: 92

Monday, September 9th 2019, 10:03pm

5 is correct

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zAquisgran [11]

Professional

Posts: 866

Location: Möhnesee

Monday, September 9th 2019, 10:23pm

Next Question:

There is 25 red fish, 47 green fish and 3 blue fish in a basket. There is a blind human
preparing dinner for the human elder at square.
What is the minimum number of fish that the blind human has to pick to make sure that
there are at least 2 different fish of different colours and elder gets a diversified dinner?

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zAquisgran [11]

Professional

Posts: 866

Location: Möhnesee

Monday, September 9th 2019, 10:53pm

Answer would have been:

He has to take 48 fish out to be sure he has 2 different taken
(there is a small probabilitty taking 47 green fish in a row)

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Ungoliant [6]

Forum Noob

Posts: 31

Monday, September 9th 2019, 10:56pm

You have 2 ropes and a lighter.

- Each rope will fully burn in exactly one hour.
- Ropes are not homogeneous, in other words, ropes do not burn in constant speed. First half of the rope can burn in a minute and the other half could burn in 59 minutes.
- You have no other means of keeping time.
You have 2 ropes and a lighter.

- Each rope will fully burn in exactly one hour.
- Ropes are not homogeneous, in other words, ropes do not burn in constant speed. First half of the rope can burn in a minute and the other half could burn in 59 minutes.
- You have no other means of keeping time.

How can you, using both of the ropes, calculate exactly 45 minutes?