Q&A - PSLE Math

[Bunny27]

MathIzzzFun:

Bunny27:

I'm not sure about tis question......

Colin and Karin save $2378.1/6 of Colin's savings is $41 more than 1/7 of Karin's savings. Find the ratio of Colins savings to Karin's savings. Express your answer in the simplest form.

TIA

Hi

Karin's savings --> 7 units
Colins savings --> 6 x ( 1 unit + 41) = 6 units + 246

total --> 13 units + 246 = 2378
1 unit --> 164

Colin's savings : Karin's savings
= 6 x 164 + 246 : 7 x 164
= 15 : 14

cheers.[/quot



Thank you

[bbkoala]

Hi Tianzhu


Thanks for your reply.
I managed to get the answer 30 using supposition, after reading your message.

Just can't understand the teacher's logic.
And DD insist it's the correct way (bcos teacher says so) but she can't explain why it's done this way.
This is what's worrying me

[fightingmom]

Hi All,

Please help :stompfeet: :stompfeet:

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 !!!

[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 !!!

[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