Q&A - P3 Math

[lect]

Hi, may i know how to solve this problem sum - John’s mass is half of his own mass plus 30kg. what is his mass?

Thank you.

[tianzhu]

lect:

Hi, may i know how to solve this problem sum - John's mass is half of his own mass plus 30kg. what is his mass?

Thank you.

Hi

Hope this helps.

Best wishes

http://farm9.staticflickr.com/8095/8381875925_c14ea89891_z.jpg\">

[ChiefKiasu]

tianzhu:

lect:

Hi, may i know how to solve this problem sum - John's mass is half of his own mass plus 30kg. what is his mass?

Thank you.

Hi

Hope this helps.

Best wishes ...

Thanks Tianzhu! Clear as a crystal as usual.

[hercules]

jon00:

Ann and Betty had the same number of bookmarks.

After Ann had given away 120 bookmarks, Betty had 4 times as many bookmarks as Ann.
How many bookmarks did both of them have at first?
How to draw the model to get the answer?
Thanks in advance.

http://i50.tinypic.com/xe337l.png\">

[BigDevil]

jon00:

Ann and Betty had the same number of bookmarks.

After Ann had given away 120 bookmarks, Betty had 4 times as many bookmarks as Ann.
How many bookmarks did both of them have at first?
How to draw the model to get the answer?
Thanks in advance.

We have seen answers of 320, as well as 400.
The key to the different answers is that some assume the bookmarks were
given to Betty (400), while some don't (320).
The question said \"Ann had given away 120 bookmarks\", but it didn't say they were given to Betty.

So, I tend to agree with the 320 answer, ie. the 120 bookmarks were given to someone else.

[hercules]

tracywham:

Hi, sorry to trouble all of you again and need your help to solve this question.


Dave has 11 times as much as Oscar. Calvin and Dave have $172. Calvin and Oscar have $92. How much does Calvin have?

Solving for fun (below is the way I train my own kids).

http://i46.tinypic.com/2nk1il2.png\">

[ksoh3000]

Hi


Can anyone help to solve this qn : ?
-The number of fleas on a dog doubles every day. By the 20th day,the dog was completely covered with fleas.
(a) On which day was the dog half-covered with fleas?
(b) On which day was the puppy a quarter-covered with fleas?


Thank You

[ksoh3000]

Tks for the prompt answer

[tracywham]

Hi, i need help to solve tis question:


A teacher would like to share some muffins equally among 8 or 9 pupils. What is the least number of muffins she should buy if she wants 2 muffins for herself as well?

Thanks alot

[qms]

tracywham:

A teacher would like to share some muffins equally among 8 or 9 pupils. What is the least number of muffins she should buy if she wants 2 muffins for herself as well?

The number of muffins should be sufficient to be shared by 8 or 9 pupils, meaning, the number must be divisible by 8 and 9. So, it is 72.

She wants 2 muffins for herself, which means she needs to buy 2 more on top of the 72.

Total = 74 muffins