Q&A - PSLE Math

[small]

Hi Tianzhu,


Thanks for your time, this question was given by the teacher and I will ask my DS to check with his teacher first. :oops:

If i did not guess wrongly, the question should be: There were 20 fewer goats than ducks.


6U - 20 + 6U + 12U = 2668 :idea:


anyway 祝您兔年行大运， 万事如意。。。

[tianzhu]

Hi small


Happy New Year.

You have another kid taking PSLE this year, I remember you have one kid who took his/her PSLE in 2009.

Best wishes

[small]

Hi Tianzhu,


Bravo, good memory... :celebrate:

You are right, my DD took her PSLE in 2009 and my DS is in P5 this year..

[small]

Please help on another question and once again many thanks.


Sigh, I only know to solve it in algebra method.

Question: A box of apples is shared among some people. If each person gets 5 apples, there will be 4 apples left. If each person gets 6 apples, there will be a shortage of 5 apples. How many people are there? My answer is 9 people

[Belle2011]

Dear all,

I have some questions to ask.

(1) A concert hall has 600 seats. 25% of the seats are premier seats while the rest are standard seats. How many premier seats must be added so that the number of premier seats will be increased to 70%?

(2) The lengths of 2 rectangles are 11m and 19m respectively. Their total area is 321m2. What is the difference in their areas?

(3) A group of people went hunting. On the average, 6 people hunted 5 rabbits, 15 people hunted 2 deer and 10 people hunted 1 buffalo. The total number of animals hunted was 6 more than the total number of people who went hunting. How many people went hunting?

I practically have no clue to start with especially with (3).

Thank-you.

Cheers,
Belle.

[small]

Hi Belle,


1) A concert hall has 600 seats. 25% of the seats are premier seats while the rest are standard seats. How many premier seats must be added so that the number of premier seats will be increased to 70%?

Solution:

My working was wrong, please referto Tianzhu's solution..

[small]

(3) A group of people went hunting. On the average, 6 people hunted 5 rabbits, 15 people hunted 2 deer and 10 people hunted 1 buffalo. The total number of animals hunted was 6 more than the total number of people who went hunting. How many people went hunting?


Solution:

My working wrong again :stupid: , please refer to Tianzhu's solution..

[tianzhu]

Belle2011:

(3) A group of people went hunting. On the average, 6 people hunted 5 rabbits, 15 people hunted 2 deer and 10 people hunted 1 buffalo. The total number of animals hunted was 6 more than the total number of people who went hunting. How many people went hunting?

Hi

I've posted this solution in one of my previous posts.

Hope this helps.

Best wishes.

http://farm3.static.flickr.com/2755/4368482573_272e22a4bb_o.jpg\">

[tianzhu]

small:

Please help on another question and once again many thanks.


Sigh, I only know to solve it in algebra method.

Question: A box of apples is shared among some people. If each person gets 5 apples, there will be 4 apples left. If each person gets 6 apples, there will be a shortage of 5 apples. How many people are there? My answer is 9 people

Hi small

This is a question on “Excess and shortage”.
Some may call it “Gap and Differences” concept.

I've posted solutions to some similar questions in page 65 of this thread.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=149&postdays=0&postorder=asc&start=640

Gap ----- 5+4 ------9
Difference ------6 - 5 ------1

Number of people ------9/1 -------9

You may also solve this question with \"Making a systemmatic list\".

1) List down the multiples of 5

2) List down the multiples of 5 + 4

3) List down the multiples of 6

4) List down the multiples of 6 - 5

5) Find the common number in (2) and (3)

Best wishes

[tianzhu]

Belle2011:

(2) The lengths of 2 rectangles are 11m and 19m respectively. Their total area is 321m2. What is the difference in their areas?

Hi

Where is this question from?
There are two answers.

Use Guess and Check/listing.

The first answer

24*11 ----- 264
3*19 ----- 57

Difference -----207

The second answer

5*11 ----- 55
14*19 ---- 266

Difference ------211

Best wishes