Tutor MathsGuru: Ask me for your burning Maths questions!

[mathsguru]

Tiramisu Coco:

Hi mathsguru,


Need your help with the following 2 qtns:

1) In a class, 16 of the pupils are boys. Then 3/4 of girls left the classroom.
If 1/6 of the original number of pupils are now girls, find the number of
pupils in the class at first.

2) The number of apples is 5/11 of the number of pears at a fruit stall. After
Mrs Fong bought half of the pears, there were a total of 189 apples and
pears left at the stall.
a) How many apples were there at the stall?
b) How many apples and pears were at the stall at first?
Thank you!

Hi Tiramisu Coco,

Here are my solutions:
http://www.postimage.org/image.php?v=Ts1fRkoS

http://www.postimage.org/image.php?v=Ts1fRmU0

Cheers,
MathsGuru

[mathsguru]

Vanilla Cake:

Hi Mathsguru,


Pls refer to http://www.orlesson.org/orp/09Ma/2009-P6-Math-SA2-PeiChun.pdf. There are no given answers for Q13 to Q18 in paper 2.
Pls kindly provide the answers for these questions. Thanks in advance.
:love:

Hi Vanilla Cake,

In case you think I've overlooked your msg, fret not! End of my lunch break, so gotta go teach tuition now...I will post my solutions to your questions as soon as I can either tonite or tmr morning.

Cheers,
MathsGuru

P/S: I would appreciate much if the questions are typed out, then I won't have to waste time typing them out. Oh, and just a thought here after reading your post (no offence though!): Sooner or later, I can \"foresee\" myself getting questions like \"Hey MathsGuru, pls provide solutions for XXX School 2009 SA2 Paper 2...\" *keeping my fingers crossed that this won't happen...*

[Tiramisu Coco]

Thank you mathsguru for the prompt reply. Really appreciate your help

[Daddy]

Hi mathsguru,



Need your help for a question below. Thanks

1) Sheila is 39 years old. She is thrice as old as her son. find her age when her son will be half as old as she.

Thanks
Daddy

[Daddy]

Hi mathsguru,


A difficult question for you.

"For each box of cookies Danny sells, he earns $2. A bonus of $3 is given to him for every 10 boxes he sells. How many boxes of cookies must he sell to earn $200."

Thanks
Daddy

[Vanilla Cake]

mathsguru:

P/S:I would appreciate much if the questions are typed out, then I won't have to waste time typing them out.

Thks, mathsguru and will take note of your remarks. Let me try to solve the 2 questions posted by \"Daddy\" while waiting for your answers for the Q13 to Q18 in Pei Chun P6 Prelim 2009 paper 2.


1) Sheila is 39 years old. She is thrice as old as her son. find her age when her son will be half as old as she.

Age of Sheila's son is 39/3 = 13 years old.
Difference in their ages is 39-13 = 26. (Note that difference in age is constant)

1 unit = 26
2 units = 52
Age of Sheila will be 52 years old when her son is half as old as she.

2)For each box of cookies Danny sells, he earns $2. A bonus of $3 is given to him for every 10 boxes he sells. How many boxes of cookies must he sell to earn $200.

For every 10 boxes sold by Danny, he earns = (10x2)+3 = $ 23
Number of 'sets' = 200/23 = 8 remainder $16

Total boxes of cookies that he must sell to earn $ 200-> (8x10)+(16/2)
= 80+8
= 88
:love:

[mathsguru]

Daddy:

Hi mathsguru,



Need your help for a question below. Thanks

1) Sheila is 39 years old. She is thrice as old as her son. find her age when her son will be half as old as she.

Thanks
Daddy

Hi Daddy,

Here's my solution. Hope it helps!

http://www.postimage.org/image.php?v=gx_Wxm9

Cheers,
MathsGuru

[mathsguru]

Daddy:

Hi mathsguru,


A difficult question for you.

\"For each box of cookies Danny sells, he earns $2. A bonus of $3 is given to him for every 10 boxes he sells. How many boxes of cookies must he sell to earn $200.\"

Thanks
Daddy

The solution:

http://www.postimage.org/image.php?v=PqFu2rr

[mathsguru]

Vanilla Cake:

Hi Mathsguru,


Pls refer to http://www.orlesson.org/orp/09Ma/2009-P6-Math-SA2-PeiChun.pdf. There are no given answers for Q13 to Q18 in paper 2.
Pls kindly provide the answers for these questions. Thanks in advance.
:love:

Hi Vanilla Cake,

Finally done!

Anyway, hope you don't misunderstand what I'm trying to put across in my earlier posting. I just didn't want anyone to abuse my intention to help here. I'm doing this voluntarily on top of my tuition lessons, so I really dun wanna waste my time & effort doing up solutions for someone who just post questions for fun. :faint: I would feel very \"cheated\" and feel as if I'm just some silly problem-solving machine... :stupid:

Hehe...that said, for those with genuine queries, I'm very much willing & happy to share/help to the best of my ability. :hugs: Feels great when parents tell me how their children gain a better understanding after they used my solutions to explain to them. Feels like I'm contributing back to the society in my own little way...haha~~

Okie, enough of my ramblings...Here are the solutions to the Pei Chun questions:

http://www.postimage.org/image.php?v=aVqAAvS

http://www.postimage.org/image.php?v=aVqAD00

http://www.postimage.org/image.php?v=aVqAH_i

http://www.postimage.org/image.php?v=aVqAKur

http://www.postimage.org/image.php?v=aVqAMZA

http://www.postimage.org/image.php?v=aVqAy0J

Cheers,
MathsGuru

[ChiefKiasu]

mathsguru:

... Anyway, hope you don't misunderstand what I'm trying to put across in my earlier posting. I just didn't want anyone to abuse my intention to help here. I'm doing this voluntarily on top of my tuition lessons, so I really dun wanna waste my time & effort doing up solutions for someone who just post questions for fun. :faint: I would feel very \"cheated\" and feel as if I'm just some silly problem-solving machine... :stupid:


Hehe...that said, for those with genuine queries, I'm very much willing & happy to share/help to the best of my ability. :hugs: Feels great when parents tell me how their children gain a better understanding after they used my solutions to explain to them. Feels like I'm contributing back to the society in my own little way...haha~~...

mathguru, to say that the community appreciates the effort you put into answering the questions is an understatement. There are lots of parents out there who do not hire math tutors for a variety of reasons. And when they try to help their children on their own and get stuck, there is little they can do. So a big Thank You for the huge effort you have put in to answer each and every query posted in this thread. Your passion as an educator really come through.

BTW, whereabouts do you teach in Singapore?