## Q&A - P5 Math

- alfretztay
- KiasuGrandMaster
**Posts:**1199**Joined:**Sun Sep 12,**Total Likes:**5

### Re: Q&A - P5 Math

I would solve the question as follows:geniuskids wrote:Need help on this question:

Islani had to read a book for his school project. On the 1st day, he read 72 pages of the book. On the 2nd day, he read 1/4 of the remaining number of pages. In the end, he still had to read 1/2 of the total number of pages to complete the book. How many pages were there in the book?

Thank you.

1st day -> 72 pages

2nd day -> 1/4 of the remaining number of pages, that is 1u out of 4u

Total -> 72+1u+3u

3u->72+1u

2u->72

1u->36

6u->36x6=216 Ans: 216 pages

- alfretztay
- KiasuGrandMaster
**Posts:**1199**Joined:**Sun Sep 12,**Total Likes:**5

### Re: Q&A - P5 Math

"Can explain in details please, also dont understand ... Thanks"

Belnanna,

Let me put it this way:

Area of a triangle = 1/2 x base x height

Note that the bases and heights of both triangles CEF and CFG are the same. Hence, their areas are also the same.

Belnanna,

Let me put it this way:

Area of a triangle = 1/2 x base x height

Note that the bases and heights of both triangles CEF and CFG are the same. Hence, their areas are also the same.

Last edited by alfretztay on Tue Jun 10, 2014 11:07 am, edited 2 times in total.

### Re: Q&A - P5 Math

ETA: I think the answer is 210 boys.hweelit wrote:Hi parents, pls help!

there are 90 more boys than girls at a school funfair. after 80% of the boys and 30% of the girls left the funfair. there were twice as many girls as boys that remained. how many boys were at funfair at first?l

### Re: Q&A - P5 Math

vy much confusing what's the purpose for designing this kind of Q for P5 kids...wi11anna wrote:Pls help me with this question. Thank you!

Try the backward way....

### Re: Q&A - P5 Math

Hi,

Can someone please kindly help me with the following question :-

Q : Joseph paid $75 for 25 similar mechanical pencils and 12 similar files. Matthew paid $23.30 for 6 such mechanical pencils and 5 such files. Find the total cost of each pencil and each file.

Thank you in advance for your kind assistance.

Can someone please kindly help me with the following question :-

Q : Joseph paid $75 for 25 similar mechanical pencils and 12 similar files. Matthew paid $23.30 for 6 such mechanical pencils and 5 such files. Find the total cost of each pencil and each file.

Thank you in advance for your kind assistance.

### Re: Q&A - P5 Math

It might be way easier if Matthew paid $23.30 for 5 such mechanical pencils and 6 such files.Jerico wrote:Hi,

Can someone please kindly help me with the following question :-

Q : Joseph paid $75 for 25 similar mechanical pencils and 12 similar files. Matthew paid $23.30 for 6 such mechanical pencils and 5 such files. Find the total cost of each pencil and each file.

Thank you in advance for your kind assistance.

Let me try and get back.

ETA: I cannot solve your original problem via the model method. I

*did*solve it via simultaneous equations, and it is fairly complicated. I am not sure a P5 student can solve it this way, even with the use of a calculator.

Can you go back and re-confirm the word problem?