10 second questions

Jai Ganesh · 2006-09-20 04:08:52

(1) Is 1298045602 a perfect square?

(2) Is 6719247 a prime number?

Jai Ganesh · 2006-09-20 04:15:35

(3) How many times would you have to write the number 6 when you write from 1 to 100?

(4) A bus contains 23 men and 14 women. In the first stop after the start, 11 men board and 2 women do. In the next stop, 6 men board and 3 women do. In the next, 2 men alight and 2 women do, but also 2 men board the bus and 2 women do. The question is, how many places did the bust stop from the start to the destination? (You are granted 20 seconds for this, as a special case!)

Devantè · 2006-09-20 04:26:07

Great to have you back, Ganesh.

1. No
2. No
3. 10? Unless it's a trick question
4. 3, not counting the start.

EDIT: Wait - I think number 4 was a trick question. You didn't specify that there was a destination - So I don't think there is way of knowing, without saying that the third stop was the destination.

Last edited by Devanté (2006-09-20 04:32:05)

Jai Ganesh · 2006-09-20 04:31:02

Hi Devante, and thanks, a big thanks for the welcome back message.
Your answers 1, 2, and 4 are absolutely right. 3.....think again....how many times would you have to write the number 6 from 60 to 66 alone ?

Devantè · 2006-09-20 04:33:23

Oh...I see.

6, 16, 26, 36, 46, 56, 60, 66, 76, 86, 96.

I think that's all of them...

I think 11.

pi man · 2006-09-20 05:40:35

got to include all of the sixty's:

6, 16, 26, 36, 46, 56, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 76, 86, 96. That's 20 (there's two in 66).

espeon · 2006-09-20 05:48:38

is 3. 14 or 16?

espeon · 2006-09-20 05:49:56

o its 11

Devantè · 2006-09-20 06:44:26

Thanks pi man. I stand corrected.

See pi man's post, Espeon.

Jai Ganesh · 2006-09-20 16:28:43

(5) In the realm of whole numbers, apart from zero and one, which the smallest number which is both a perfect square and a perfect cube?

(6) What is the angle between the hands of a clock when the time is 8.00?

(7) What is the side total of a 3X3 magic square with numbers from 1 to 9?

(8) How many zeros does a trillion (US) contain?

(9) What are the common factors of 111, 222, 333, 444, 555, 666, 777, 888, and 999? (Four of them)

(10) How many furlongs is a mile?

justlookingforthemoment · 2006-09-20 16:53:51

5) 64
6) 240°
7) 15
8) 12 (alternatively, 'a trillion (US)' contains no zeros)
9) 1, 3, 37, 111
10) 8

Devantè · 2006-09-21 04:39:59

5. 64
6. 240 degrees
7. 15
8. 12 - And in the UK it is 18.
9. 1, 3, 37, 111
10. 8

I'll check my answers when I have time, I'm pretty sure one of my answers doesn't look right.

Jai Ganesh · 2006-09-22 16:20:29

Great, Devante` and justlookingforthemoment, your replies are all correct

Jai Ganesh · 2006-09-22 18:06:37

11. What is so special about the number 2.7182818284.... to mathematicians?

12. How many nano seconds is a second?

13. Which number has got the highest probability of being displayed when a pair of dice is cast?

Jai Ganesh · 2006-09-22 20:06:28

14. How many seconds is an hour?

15. How many digits is 22/7 a correct aprroximation of pi?

justlookingforthemoment · 2006-09-22 20:36:53

espeon · 2006-09-23 00:06:32

14. 60x60=3600 seconds
12.100?

Last edited by espeon (2006-09-23 00:07:31)

Devantè · 2006-09-24 04:06:32

I'll count the nanosecond noughts afterwards.

Jai Ganesh · 2006-09-26 20:57:35

Excellent, all of you, Devante', jl, espeon.

16. How many prime numbers are there from 1 to 100?

17. How many numbers, including 7, are divisible by 7 from 1 to 100?

Devantè · 2006-09-27 06:42:41

16. 25, obviously not counting 1.

17. 14? This is probably like the one with the sixes.

Devantè · 2006-09-27 06:44:29

I read justlookingforthemoment's answers after Ganesh told us that we were correct (and Espeon).

It's e not e!.

espeon · 2006-09-27 07:28:13

yay?

Devantè · 2006-09-27 08:04:23

Remember that a nanosecond is extremely small. It is a big number, but it an extremely small unit of time.

justlookingforthemoment · 2006-09-27 11:04:09

Devanté wrote:

It's e not e!.

Yeah, I knew someone would write that, because I wrote it in a maths project once.

Something like, 'And that shows that the height of the cube is x!'

Devantè · 2006-09-28 03:19:10

I also did something like that. Never put emotion into your math - The teacher doesn't look upon it very kindly.

Math Is Fun Forum

#1 2006-09-20 04:08:52

10 second questions

#2 2006-09-20 04:15:35

Re: 10 second questions

#3 2006-09-20 04:26:07

Re: 10 second questions

#4 2006-09-20 04:31:02

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#5 2006-09-20 04:33:23

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#6 2006-09-20 05:40:35

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#7 2006-09-20 05:48:38

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