Q&A - P3 Math

[mrswongtuition]

peggy:

Can anyone help me with this P4 Qtn ?


Annie has an amount of cookies less than 60. If she packs in a bag of 5, there'll be 2 left. But if she packs in a bag of 7, she'll be short of 3. How many cookies does she has ?

Help !!!

Multiples of 5 + 2 left:
7, 12, 17, 22, 27, 32, 37, 42, 47, 52, 57

Multiples of 7 - 3 short:
4, 11, 18, 25, 32, 39, 46, 53, 60


Common: 32

She has 32 cookies.

[yeonee]

peggy:

Can anyone help me with this P4 Qtn ?


Annie has an amount of cookies less than 60. If she packs in a bag of 5, there'll be 2 left. But if she packs in a bag of 7, she'll be short of 3. How many cookies does she has ?

Help !!!

Hi, I learn from somewhere you can apply the following method:-

Multiple of 5
5,10,15,20,25,30,35,40,45,50,55
(+2)
7,12,17,22,27,32,37,42,47,52,57

Multiple of 7
7,14,21,28,35,42,49,56,63
(-3)
4,11,18,25,32,39,46,53,60

The answer is 32 cookies

[peggy]

yeonee,


Thank you so much for sharing !!
And the explanation is very clear.

[yeonee]

peggy:

yeonee,


Thank you so much for sharing !!
And the explanation is very clear.

You are welcome.

[peggy]

Need help for this !


Don had twice as much savings as Max and had thrice as much savings as Jon. If the three of them had a total savings of $154, how much more money did Don have than Jon?

[tianzhu]

peggy:

Need help for this !


Don had twice as much savings as Max and had thrice as much savings as Jon. If the three of them had a total savings of $154, how much more money did Don have than Jon?

Hi

I suggest you use MD

Don ---- 6 units
Max ---- 3 units
Jon ---- 2 units

11 units ---- 154
1 unit ---- 14

4 units ----- 56

Best wishes

[peggy]

Hi tianzhu,


Thanks for your reply !!

[tianzhu]

peggy:

Hi tianzhu,


Thanks for your reply !!

Hi

You're welcome.

Best wishes

[yeonee]

tianzhu:

Hi, hope this helps.


http://farm4.static.flickr.com/3463/3993421153_4806021a53_o.jpg\">

Can I use the multiples of 3 and 4 for this question?

[tianzhu]

yeonee:

Can I use the multiples of 3 and 4 for this question?

Hi

It'll be helpful if you could elaborate on this.

Best wishes