Q&A - PSLE Math

[MathIzzzFun]

fightingmom:

Hi All,


Please help with the following question:

Jim bought some chocolates and gave half of them to Ken. Ken bought some sweets and gave half of them to Jim.

Jim ate 12 sweets and Ken ate 18 Chocolates. After that, the number of sweets and chocolates Jim had were in the ratio 1:7 and the number of sweets and chocolates Ken had were in the ratio 1:4.

How many sweets did Ken buy?

thanks !!!

Hi

You may want to look at similar questions in previous posts. Here are two :

http://www.flickr.com/photos/62167097@N02/5932660565/in/photostream

http://www.flickr.com/photos/62167097@N02/6594157121/in/photostream

cheers.

[imacsg]

Can someone help me?


Study the number pattern below carefully.

What is the missing number in the box?

4, 6, 8, 12, 24, 36, ____, 144, 480

Thanks.

[tianzhu]

imacsg:

Can someone help me?


Study the number pattern below carefully.

What is the missing number in the box?

4, 6, 8, 12, 24, 36, ____, 144, 480

Thanks.

Hi

24*4 ------ 96

Missing number is 96

Best wishes

[jessielu]

Need help on below question:


A dictionary cost $11 more than a book.  The book cost $45 more than a magazine.  Mr lee paid a total of $252 for 6 pieces of each item.  What is the cost of a book?

Appreciate the steps to solve this

[imacsg]

Hi Tian Zhu,

Why is it 24 x 4 ? I could not see the pattern. Can u help to show me the pattern? Thanks

[tianzhu]

imacsg:

Hi Tian Zhu,

Why is it 24 x 4 ? I could not see the pattern. Can u help to show me the pattern? Thanks

Hi

First number, second number ------ multiply by 2 ------ gives Third number, Fourth number

4*2 ------ 8
6*2 ------ 12

Third number, Fourth number ------ multiply by 3 ------ gives Fifth number, Sixth number

8*3 ------ 24
12* 3------ 36

Fifth number, Sixth number ------ multiply by 4 ------ gives Seventh number, Eighth number

24*4 ------ 96
36* 4------ 144

If you continue

96*5 ------- 480

Best wishes

[imacsg]

Thanks.


Never think of it.

[tianzhu]

jessielu:

Need help on below question:


A dictionary cost $11 more than a book.  The book cost $45 more than a magazine.  Mr lee paid a total of $252 for 6 pieces of each item.  What is the cost of a book?

Appreciate the steps to solve this

Hi

6 pieces of each item ----- these means 6 dictionaries, 6 books and 6 magazines.

(45*6) is already more than 252?

Please check your question with your source?

Best wishes

[YumYum]

Hi, can someone pls help with this Qn:


In a hall, 40% of the pupils are boys. After 10 girls left the hall, the percentage of girls decreased to 55%. How many boys are there in the hall?

Thanks!

[tianzhu]

YumYum:

Hi, can someone pls help with this Qn:


In a hall, 40% of the pupils are boys. After 10 girls left the hall, the percentage of girls decreased to 55%. How many boys are there in the hall?

Thanks!

Hi

The number of boys remained the same before and after.

At first
Boys : Girls -------- 2:3 (40%:60%) ------ 18:27

In the end
Boys : Girls -------- 9:11 (45%:55%) ------- 18:22

Make the units for boys the same

5 units ------- 10
1 unit ------ 2

Number of boys -------18*2 -------36

Best wishes