MathIzzzFun:

Dazzle:

MathIzzzFun,


I don't understand: 'In the end, children : adults --> 7u+ 7: 10u + 10'
Where did the +7 and +10 come about? Please explain. Thanks.

Hi

10 Adults boarded. So, total number of adults in the end will be original number + 10 ie 10u + 10.
10u + 10 = 10 x (1u +1) --> 10 shares, 1 share--> 1u+1
In the end, adults: children --> 10 shares : 7 shares
7 shares --> 7 x (1u+1) = 7u + 7


cheers.

thanks a lot. Now I understand.

MathIzzzFun,


I don’t understand: ‘In the end, children : adults –> 7u+ 7: 10u + 10’
Where did the +7 and +10 come about? Please explain. Thanks.

Question from 2011 Nanyang SA1 paper


At Station A, the ratio of the number of children to the number of adults on a train was 4:5. At the next station, 12 children alighted and 10 adults boarded the train. The ratio of the number of children to the number of adults on the train then became 7:10. How many children were on the train at first?

That’s why I am so disappointed. Subsequently, I stopped bring maid out for dinner in expensive restaurants. I also no longer trusted them wholeheartedly.

I treated maid like family member, even bring her to restaurant to eat set meal costing $60++ each, bring her to church every Sunday, loan her money for her father’s operation for heart problem, trusted her completely … in the end, found out that she stole big time from us!!! So treating maid like family member will not guarantee that maid will be good or faithful to you. Though I do believe there are maid who will reciprocate, I am one of those who met with one who is ungrateful. So disappointed.

The Principal has paid a price for his moment of weakness. His career in education is gone, his marriage might be on the rock (I hope his wife will give their marriage another chance), his dignity as a father is in tatter. It is morally wrong of him for what he did, but on the professional front, I think he has done a good job and he is a very caring VP at my son’s school. I hope after this incident, he is able to move on and earn his stripe again. Everybody make mistake, but it take great courage to own up and turn over a new leaf.

mn:

I came across this article on \"How to Annotate\" hope this will be useful. I have not tried this but will try out this CNY holidays. If can get to see a sample will be great so we have an idea of how it looks like. Hope tclhub and psle2011mummy can share with us. :thankyou:


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May I know how to enlarge the article you posted? I can't read the small print properly. Thanks.

ksmama:

Hi, tianzhu, tks for reminder that can use units in equal total concept.

Soln in units method:
Case 1 mrs Li. M:W
3:1. (total 4 units)

Case2 mr Li. M:W
4:1. (total 5 units)

Since we knw total no of people shd b d same, convert the total units to the same using LCM of 4 n 5

So case 1 bcom. M:W
15:5 (prev no x 5)

Case 2. M:W
16:4 (previous no x 4)

Therefore no of men=16; women=5

Just have a closer look, shouldn't Case 1 should be Mr Li and Case 2 is Mrs Li ?

Tianzhu and ksmama,

Thanks for solving the handshake problem.

tianzhu:

match3frog:

- My dd always have problems with this type of questions. How to teach her to solve them?

3) A group of people met at a party. Each person shook hands with everyone else. Mr Li shook hands with 3 times as many men as women. Mrs Li shook hands with 4 times as many men as women. How many men and how many women were there at the party.

Thanks!

Hi

To make it more interesting, let’s imagine Mr and Mrs Li are hosting a party in a private room in a restaurant.

We have two scenarios here. The number of people in the room remains the same in these two scenarios.

1)When Mr Li shook hands with everyone else
2)When Mrs Li shook hands with everyone else.

If you refer to the MD, the number of women is shown by 1 unit + 1 (Mrs Li).

Besides MD, you may also use UM (Units Method) to solve this question.

So enjoy the moment and have fun.

Best wishes

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Hi Tianzhu,

I stumble upon this link and find it very useful. Being new, I am still trying to figure out the lingo used here. May I know what is MD? Also, will you show how to solve this using Unit Method? Thanks