Q&A - PSLE Math

[is_me_lblue]

Hi,


I need help for the following :

Jan and Kay had equal number of sweets and equal numbers of chocolates. Jan ate 12 sweets and Kay ate 18 chocolates and then the ration of Jan’s sweets to chocolates became1:7 and the ration of Kay’s sweets to chocolates became 1:4. How many sweets did Jan have at first ?

The answer given is 34 sweets.

[tianzhu]

Hi peggy


Good afternoon

In this question, we shall be using a strategy called “Working backwards”.

In layman terms, it’s reversing.How wonderful it would be if we could apply “Working backwards” in our life journey?

Once you become more familiar with this method, you may consolidate the MD without breaking them up.

However, if I may suggest, I would like to “solve part of the problem” by breaking the question into sub problems which are more easily managed.

For this solution, I’ve shown more MD to show the transaction. Once you become more seasoned, you may choose not to draw some of them.

Hope you’ll find it useful.

Best wishes.

http://farm6.static.flickr.com/5213/5473328668_0005b89f67_z.jpg\">

[tianzhu]

Cheerfuldad:

Hi Tianzhu,

Thank you for showing me the link! Very much appreciated.

Hi Cheerfuldad

Good afternoon.

You're welcome.

Best wishes

[Brenda10]

tianzhu:

http://farm6.static.flickr.com/5213/5473328668_0005b89f67_z.jpg\">

Hi Tianzhu

This picture is so beautiful and remind me of 世外桃源.

Thank you

[tianzhu]

is_me_lblue:

Hi,


I need help for the following :

Jan and Kay had equal number of sweets and equal numbers of chocolates. Jan ate 12 sweets and Kay ate 18 chocolates and then the ration of Jan's sweets to chocolates became1:7 and the ration of Kay's sweets to chocolates became 1:4. How many sweets did Jan have at first ?

The answer given is 34 sweets.

Hi

Good Afternoon.

This question is a modified version of a question from PSLE 2009.

You may use MD or Units Method to solve it.

Once you get the MD done, all you need to do is to compare the number of chocolates of Jan and Kay.

Hope this helps.

Best wishes.

http://farm6.static.flickr.com/5133/5473929452_1688f4c2ee_b.jpg\">

[tianzhu]

Brenda10:

Hi Tianzhu

This picture is so beautiful and remind me of 世外桃源.

Thank you

Hi Brenda10

Good Afternoon.

You're welcome.

I am happy you liked it.

Best wishes

[moonee]

:!: Thanks for the explanation, wow you are very creative! My dd likes the frogs and with the help of the frogs, colours and lines, my dd was able to understand the method. :celebrate:

[youngtay]

Mr Tianzhu


Thanks.

[is_me_lblue]

is_me_lblue:

Hi,


I need help for the following :

Jan and Kay had equal number of sweets and equal numbers of chocolates. Jan ate 12 sweets and Kay ate 18 chocolates and then the ration of Jan's sweets to chocolates became1:7 and the ration of Kay's sweets to chocolates became 1:4. How many sweets did Jan have at first ?

The answer given is 34 sweets.

Tianzhu,

Thank you very much

[tianzhu]

youngtay:

Mr Tianzhu


Thanks.

Hi

You're welcome.

Best wishes