Tutor MathsGuru: Ask me for your burning Maths questions!

[MathIzzzFun]

concern_mum:

hi Guru, thank you for your clear explanation. Q1 seems to be a problem. I have a feeling that the information is insufficient for this question.

Hi

u r welcome.. I am no guru la.. just trying to help out here.

q1 type of problem sums are quite common. for eg.

http://www.flickr.com/photos/62167097@N02/6160671185/in/photostream

http://www.flickr.com/photos/62167097@N02/6175230767/in/photostream

cheers.

[trileets]

Hi, anyone can help me with this?


Ahmad has $40 more than Ben. After giving 1/5 of his money to Ben, Ben now has 7/8 of what Ahmad has. How much did they have?

Thanks a million!

[trileets]

Thanks for your response. It’s for a pri sch kid.

[trileets]

Yes please! Will appreciate very muchhh… thank you.

[MathIzzzFun]

trileets:

Hi, anyone can help me with this?


Ahmad has $40 more than Ben. After giving 1/5 of his money to Ben, Ben now has 7/8 of what Ahmad has. How much did they have?

Thanks a million!

Hi

solution posted at this thread - http://www.kiasuparents.com/kiasu/forum/viewtopic.php?f=67&t=25121&start=90

cheers.

[trileets]

:thankyou: Aceumaths and Mathizzit!!



aceumaths , I can solve with Algebra but doubt if my child can fully understand.

Mathsizzfun, saw your solution, got it! It's clear and easily understood. Will show to my DS when he comes home.

Cheers!

[MathIzzzFun]

trileets:

:thankyou: Aceumaths and Mathizzit!!



aceumaths , I can solve with Algebra but doubt if my child can fully understand.

Mathsizzfun, saw your solution, got it! It's clear and easily understood. Will show to my DS when he comes home.

Cheers!

u r welcome

cheers.

[trileets]

sorry, need help for 1 more quest


When Janice bought some files,the average cost was $4. After she bought 1 more file at $16, the average cost became $7. How many files did she buy at first?

Thanks

[MathIzzzFun]

trileets:

sorry, need help for 1 more quest


When Janice bought some files,the average cost was $4. After she bought 1 more file at $16, the average cost became $7. How many files did she buy at first?

Thanks

Hi

\"Decrease\" in cost of the additional file
= Increase in average cost of the original number of files

So, $16- $7 = ($7-$4) x N, N = original number of files
N = 3

Total number of files = 3+1 = 4

Alternatively, you can also assume that the cost of the additional file was increased from $4 to $16 ie increase of $12 and this is averaged over all the files such that the average cost increase from $4 to $7,
number of files = $ 12 / ($7- $4) = 4

cheers.

[trileets]

:thankyou:


Once again for your time. Took a little time to digest as I'm better at using Algebra. But finally saw the light!

Cheers!!