Tutor MathsGuru: Ask me for your burning Maths questions!

[Dharma]

maths6a:

Hi some of us cannot seem to agree with the answer to this question so pls help:-

John was in the middle of a flight of stairs. He went up 3 steps, came down 5 and then up 8 and he was at the top. How many steps were there on the flight of stairs.

Many thanks

Oh and can some one tell me how I can make attachments when I have diagrams to questions? Thanks

You are in the middle position

Next determine your position when you move up or down withbrespect to the middle position.

Move up 3 stairs =>Middle position + 3 stairs
Move down 5 stairs => Middle position - 2 stairs ( 2 stairs below the middle position) . Move down 3 stairs to reach middle position and move down another 2 stairs
Move up 8 stairs => Middle position + 6 (move up 2 stairs to reach middle position, then move another 6 stairs to reach the top)

Total number of stairs = ( 6 x 2 ) + 1 = 13

[Dharma]

maths6a:

Oh and can some one tell me how I can make attachments when I have diagrams to questions? Thanks

Hi maths6a,

Click 'Add Image To Post'
Select your image that u wish to upload
Upload image

[starlight1968sg]

maths6a:

John was in the middle of a flight of stairs. He went up 3 steps, came down 5 and then up 8 and he was at the top. How many steps were there on the flight of stairs.

What is the ans? Mine is 12.

[SoWoW]

Hi need help again,


Question:-
Clara has some sweets. If she packs them in groups of 5, she will have 3 extra sweets. If she packs them in groups of 8, she will have 7 extra sweets. What is the minimum number of sweets clara has?

What is the correct method or working to show on the exam paper?
And is the answer 23 or 63? And why is that so?
thanks alot

[tianzhu]

maths6a:

Oh and can some one tell me how I can make attachments when I have diagrams to questions? Thanks

Hi

Please follow these steps

1) Do a print screen of the portion you want to upload.

2) Edit using Paint. Cut out the portion of the question you want to upload.

3) Save file in Pictures

4) Go to Flickr (Free sign up as member) or other storage sites. Upload file. Select biggest/medium size. Right click to copy URL of image.

5) Coming back to Kiasuparents forum, click insert image button.

Best wishes

[starlight1968sg]

SoWoW:

Clara has some sweets. If she packs them in groups of 5, she will have 3 extra sweets. If she packs them in groups of 8, she will have 7 extra sweets. What is the minimum number of sweets clara has?

What is the correct method or working to show on the exam paper?
And is the answer 23 or 63? And why is that so?
thanks alot

My girl would use Guess & Check method:
A: 1st situation ie groups of 5 then have 3 extra
B: 2nd situation ie groups of 8 then have 9 extra

Groups: 1,2,3,4,.....
A:8,13,18,23,28
(1*5+3,2*5+3,...)

B:15,23,...
(1*8+7, 2*8+7,...)

My ans is 23. :roll:

[SoWoW]

starlight1968sg:

SoWoW:

Clara has some sweets. If she packs them in groups of 5, she will have 3 extra sweets. If she packs them in groups of 8, she will have 7 extra sweets. What is the minimum number of sweets clara has?

What is the correct method or working to show on the exam paper?
And is the answer 23 or 63? And why is that so?
thanks alot

My girl would use Guess & Check method:
A: 1st situation ie groups of 5 then have 3 extra
B: 2nd situation ie groups of 8 then have 9 extra

Groups: 1,2,3,4,.....
A:8,13,18,23,28
(1*5+3,2*5+3,...)

B:15,23,...
(1*8+7, 2*8+7,...)

My ans is 23. :roll:

How to identify whether it is a guess & check method or \"gap and differences method\" to use?

[starlight1968sg]

SoWoW:

[How to identify whether it is a guess & check method or \"gap and differences method\" to use?

I questioned the purpose of Guess & Check method as a lot of times, one has to have some luck to solve this type of question.

Imagine somewhere down the line, I made a miscalculation and forever, am not going to get the correct answer.

[Dharma]

SoWoW:

Hi need help again,


Question:-
Clara has some sweets. If she packs them in groups of 5, she will have 3 extra sweets. If she packs them in groups of 8, she will have 7 extra sweets. What is the minimum number of sweets clara has?

What is the correct method or working to show on the exam paper?
And is the answer 23 or 63? And why is that so?
thanks alot

If arranged into
Group of 5 => R3 (remainder 3 sweets)
Group of 8 => R7

No of sweets Clara had + 2 sweets => multiple of 5
No of sweets Clara had + 1 sweet => multiple of 8


Find the smallest number which is a multiple of 5 but when divided by 8 gives a remainder of 1.

It is 25 => 25 divide by 8 = 3R1

Smallest number of sweets Clara had = 25 - 2 = 23
or
24 - 1 = 23

[maths6a]

Hey I noticed the flight of stairs question came back with 2 answers, 12 and 13.


@ @ @ % @ & @ @ * @ @ top
------------middle&
-------------------up 3 *
-----------down 5 %
---------------------up 8 (top)
so 12 isn’t it?


if there are 13, the middle will be in between two steps?

Or can we accept both answers as claimed by someone?

Thanks for enlightening us.