Q&A - P3 Math

[ttyh]

Hi

Sorry to bother you all with a simple problem. My xx brain not functioning too well today

Benny’s saving was 7 tomes as much as Muthu’s savings.
After spending $20, Benny had $25 more than Muthu. How much was Benny’s savings at first?

[tianzhu]

ttyh:

Hi

Sorry to bother you all with a simple problem. My xx brain not functioning too well today

Benny's saving was 7 tomes as much as Muthu's savings.
After spending $20, Benny had $25 more than Muthu. How much was Benny's savings at first?

Hi ttyh

It is suggested that you draw a MD.

Benny ----- 7 units
Muthu ------ 1 unit

6 units -------20+25 -----45
1 unit ------7.5

Benny -------52.50

Best wishes

[Blur Baby]

Hello Uncles and Aunties, can you please help me with this question? Thank you.



Siti and Mohan started counting at the same time. Siti counted on by hundreds from 2000. Mohan counted backwards by thousands. After 4 counts, they had reached the same number. What number did Mohan start counting from?

[Blur Baby]

One more question please? My test is tomorrow. Thank you.



3 similar files and 2 similar books cost $60. 2 such files and 3 such books cost $70. Find the cost of 1 file.

[Blur Baby]

Can someone please help me to answewr the 2 questions? Thank you.

[small]

Blur Baby:

One more question please? My test is tomorrow. Thank you.



Hope this helps.

3 similar files and 2 similar books cost $60. 2 such files and 3 such books cost $70. Find the cost of 1 file.

3 files and 2 books cost $60 --------(1)
2 files and 3 books cost $70 -------(2)

So:
5 files and 5 books cost $130
1 file and 1 book cost $26
2 files and 2 books cost $52 -------(3)


From (1):

3 files and 2 books = 1 file + 2 files and 2 books
$60 = 1 file + $52
1 file = $8

1file cost $8

[vlim]

Blur Baby:

Hello Uncles and Aunties, can you please help me with this question? Thank you.



Siti and Mohan started counting at the same time. Siti counted on by hundreds from 2000. Mohan counted backwards by thousands. After 4 counts, they had reached the same number. What number did Mohan start counting from?

Hi Blur Baby, aunty vlim hereby try to help you since tianzhu not around now..

After 4 counts, Siti would be : 2000, 2100,2200, 2300
Since both reached the same number after 4 counts, so Mohan would be 2300 after counting backwards by thousands after 4 counts
2300, 3300, 4300,5300

so Mohan start counting from 5300.

Hope u understand my explanation

[Blur Baby]

vlim:

Blur Baby:

Hello Uncles and Aunties, can you please help me with this question? Thank you.



Siti and Mohan started counting at the same time. Siti counted on by hundreds from 2000. Mohan counted backwards by thousands. After 4 counts, they had reached the same number. What number did Mohan start counting from?

Hi Blur Baby, aunty vlim hereby try to help you since tianzhu not around now..

After 4 counts, Siti would be : 2000, 2100,2200, 2300
Since both reached the same number after 4 counts, so Mohan would be 2300 after counting backwards by thousands after 4 counts
2300, 3300, 4300,5300

so Mohan start counting from 5300.

Hope u understand my explanation

Thank you Aunty vlim.

[Blur Baby]

small:

Blur Baby:

One more question please? My test is tomorrow. Thank you.



Hope this helps.

3 similar files and 2 similar books cost $60. 2 such files and 3 such books cost $70. Find the cost of 1 file.

3 files and 2 books cost $60 --------(1)
2 files and 3 books cost $70 -------(2)

So:
5 files and 5 books cost $130
1 file and 1 book cost $26
2 files and 2 books cost $52 -------(3)


From (1):

3 files and 2 books = 1 file + 2 files and 2 books
$60 = 1 file + $52
1 file = $8

1file cost $8

Thank you Uncle Small.

[DinoKing]

pertunia wrote:

small wrote:
Hassan has some pokemon cards to share among his friends. If he gives each friend 6 pokemon cards, he will have 5 cards left. If he gives each friend 8 pokemon cards, he will be short of 7 pokemon cards. How many pokemon cards does Hassan have?

Gap : 5+7 = 12

Different = 8 - 6 = 2
12 / 2 = 6 friends

From red font :
6 cards x 6 + 5 cards
= 41 cards

Hassan have 41 pokemon cards altogether.





Hi small,

Can you please explain why you use gap = 5+7? I am missing something here. Thanks.

And thanks to all the others who help with the answers. Really appreciate it.



Hi pertunia,

I am using Inference Approach to solve this, learned this from my son.


Alternatively you can refer to Tianzhu's solution on other question.

http://www.kiasuparents.com/kiasu/forum/viewtopic.php?t=280&postdays=0&postorder=asc&start=2490

Hi, can we use the above Inference Approach to solve below question (Ai Tong 2010 CA1 paper):Mrs Chan has more than 50 sweets. If she puts them in packets of 7, she has 5 sweets left.  If she puts them in packets of 9, she has 6 sweets left.  How many sweets does Mrs Chan have?  (provided ans is 96).If yes, is it okay to show me how to derive the answer?  Thank you very much.