Tutor MathsGuru: Ask me for your burning Maths questions!

[Dharma]

CoffeeCat:

Superbugs:

Hi Coffeecat,

Tks for your prompt reply but why add 4 where the total no. of chairs is only 108? This is something which I do not understand.

The sec question was correctly listed but ans is only 131...

Ar, this is a bit hard to explain.
Why do u choose to minus 4?
From your working, I think u kinda understand what u r supposed to do.
To find the total number of chairs along the length + total number of chairs along the breadth
Minus-ing the 4 corners isnt going to be correct.... We add the four corners because ...

maybe you wana draw a diagram
X X X X X X X X X
X X
X X X X X X X X X
(please imagine the 2nd X in the 2nd row as to the far right...)
In this diagram, there are 9 X along the length, 3 along the breadth.
What's the total?
7 + 7 + 1 + 1 + 4 (corners) = 20
But length = 9 breadth =3.
2 length + 2 breadth = 24
There is a shortage of 4 because the 4 corners are only counted once in the first scenario when they are in fact double counted in the second scenario.

Hi Superbugs,

Think there is a typo error in the Qn ... should be 9 stacks of chairs instead of 8.
Total number of chairs = 12 x 9 = 108
Number of chairs in the corners = 4
Balance number of chairs to be placed at equal spacing between the corners = 108 – 4 = 104
L + B = 104/2 = 52
(L + 2)/ (B + 2) = 3/1
L + 2 = 3B + 6
L – 3B = 4
4B = 48
B = 12
L = 52 – 12 = 40
Number of chairs placed along one of the length = 40 + 2 = 42

[Superbugs]

Dharma:

CoffeeCat:

[quote=\"Superbugs\"]

Hi Coffeecat,

Tks for your prompt reply but why add 4 where the total no. of chairs is only 108? This is something which I do not understand.

The sec question was correctly listed but ans is only 131...

Ar, this is a bit hard to explain.
Why do u choose to minus 4?
From your working, I think u kinda understand what u r supposed to do.
To find the total number of chairs along the length + total number of chairs along the breadth
Minus-ing the 4 corners isnt going to be correct.... We add the four corners because ...

maybe you wana draw a diagram
X X X X X X X X X
X X
X X X X X X X X X
(please imagine the 2nd X in the 2nd row as to the far right...)
In this diagram, there are 9 X along the length, 3 along the breadth.
What's the total?
7 + 7 + 1 + 1 + 4 (corners) = 20
But length = 9 breadth =3.
2 length + 2 breadth = 24
There is a shortage of 4 because the 4 corners are only counted once in the first scenario when they are in fact double counted in the second scenario.

Hi Superbugs,

Think there is a typo error in the Qn ... should be 9 stacks of chairs instead of 8.
Total number of chairs = 12 x 9 = 108
Number of chairs in the corners = 4
Balance number of chairs to be placed at equal spacing between the corners = 108 – 4 = 104
L + B = 104/2 = 52
(L + 2)/ (B + 2) = 3/1
L + 2 = 3B + 6
L – 3B = 4
4B = 48
B = 12
L = 52 – 12 = 40
Number of chairs placed along one of the length = 40 + 2 = 42[/quote]Tks for the explanation. The latter might be too difficult for my DD to understand.

I have another question, appreciate your help:

Jovi has 2 strings, string A and string B. Initially, string A was thrice the length of string B. Jovi then cut 9.1m from string A and 140cm from string B. The length of string B became 1.5 times of string A. What is the length of string A at first? Express your answer in cm?

[MathIzzzFun]

Superbugs:

I have another question, appreciate your help:

Jovi has 2 strings, string A and string B. Initially, string A was thrice the length of string B. Jovi then cut 9.1m from string A and 140cm from string B. The length of string B became 1.5 times of string A. What is the length of string A at first? Express your answer in cm?

Hi

Hope this helps :lol:

http://www.flickr.com/photos/62167097@N02/5709910478/in/photostream

cheers.

[2cutis]

MathIzzzFun:

2cutis:

Please help :imdrowning: ,


We know 2 sq is 2x 2 and 2 cube is 2x2x2 but what's the solution
to 2 to the power of 50?

Hi

2 to power of 50
= 2 x 2 x 2 x 2 x ... x2 x 2
(50 '2's)
= 1024 x 1024 x 1024 x 1024 x 1024
= 1 petabyte

cheers.

Thanks, MathIzzzFun

[MathIzzzFun]

2cutis:

MathIzzzFun:

[quote=\"2cutis\"]Please help :imdrowning: ,


We know 2 sq is 2x 2 and 2 cube is 2x2x2 but what's the solution
to 2 to the power of 50?

Hi

2 to power of 50
= 2 x 2 x 2 x 2 x ... x2 x 2
(50 '2's)
= 1024 x 1024 x 1024 x 1024 x 1024
= 1 petabyte

cheers.

Thanks, MathIzzzFun[/quote]you are welcome :lol:

cheers.

[MathIzzzFun]

Superbugs:

MathIzzzFun:

[quote=\"Superbugs\"]Hi there, someone pls help me with the following questions:


Mdm Lek had 57 apples and oranges altogether. There were 3 fewer oranges than apples. Sh egave away half as many oranges as apples and was left with twice as many oranges as apples. How many apples did she give away?

I can only do up to here:
2U+3 => 57
1U=>27
Oranges =>27
Apples => 27+3 => 30

Hi

Hope this helps :lol:

http://www.flickr.com/photos/62167097@N02/5705956596/in/photostream

cheers.

Wow impressive. I got it. Tks a lot.
Can anyone help with my earlier two questions pls. Tks[/quote]thank you, glad to be of help :lol:

cheers.

[Superbugs]

MathIzzzFun:

Superbugs:

I have another question, appreciate your help:

Jovi has 2 strings, string A and string B. Initially, string A was thrice the length of string B. Jovi then cut 9.1m from string A and 140cm from string B. The length of string B became 1.5 times of string A. What is the length of string A at first? Express your answer in cm?

Hi

Hope this helps :lol:

http://www.flickr.com/photos/62167097@N02/5709910478/in/photostream

cheers.

Dear MathIzzzFun,
You are really good. Tks a lot!

[canberra12377]

Hi Tutor MathsGuru,


Do you provide 1-1 tuition ?

Regards
Melinda

[Vanilla Cake]

Pls :imdrowning: and TIA for your time cum effort.


http://i51.tinypic.com/2q03s3t.jpg\">
Answer given : 415

[Vanilla Cake]

Pls :imdrowning: and TIA for your time cum effort.


http://i52.tinypic.com/2v0dee0.jpg\">

Answer given: 11 and 2/3 cm2