Q&A - PSLE Math

[Michaelia0816]

I wish someone would like to solve my science question, I got a lot more!

[cimman]

dicoyote:

Hi All,


I have a difficulty in this question, seeking help, thanks in advanced

\"The average height of a group of children was 139.4 cm

When Mr Tan measured and recorded the height of these children, he wrongly recorded one child's height as 192 cm when it should have been 129 cm.
As a result, Mr Tan calculated the average height as 142.4 cm.

How many children were there in the group?\"

if you don't mind doing this in algebra, here's a solution using equations:

c = number of children
total value/c = 139.4
(total value + 63)/c = 142.4 (note: 63-> 142.4 - 129)
total value/c + 63/c = 142.4
139.4 + 63/c = 142.4
c = 21

[isetan]

MathIzzzFun:

kyp71:

[quote=\"kyp71\"]Please help anyone ?


The figures below is made up of a square, a quadrant and a semicircle. (take pie = 3.14)
(a) Find the perimeter of the shaded parts
(b) Find the difference in the area between the shaded parts.
http://i46.tinypic.com/1zxs7sj.jpg\">

Anyone can help me solve ?

Hi

I think you should be able to find the solution with this

http://i49.tinypic.com/344xv9g.png\">

note that such questions are actually same as \"age\" problems ie same gap/difference.

cheers.[/quote]Hi ,
Just attempt this question.....is the ans:-
For (a) 29.7
(b) 1.57

[Chan09]

http://i45.tinypic.com/2evthdd.jpg\"> help, tks

[tianzhu]

Chan09:

http://i45.tinypic.com/2evthdd.jpg\"> help, tks

Hi

Please refer to this similar question.

The answer to your question is 1/2.

Best wishes

http://farm7.staticflickr.com/6151/6191262010_71cc0ec1fd_z.jpg\">

[tianzhu]

isetan:

Hi ,
Just attempt this question.....is the ans:-
For (a) 29.7
(b) 1.57

Hi

We have the same answers.

Best wishes

[tamunawara]

hi can someone help me with this question


Andy had only $2 notes and Bryan had only $5 notes. the number of notes Andy had was 80% of Bryan’s notes. When Bryan gave Andy $550, the number of notes Andy had became thrice that of Bryan.

a)How many notes did Bryan have at first?
b) How much money did Andy have in the end?

[tianzhu]

tamunawara:

hi can someone help me with this question


Andy had only $2 notes and Bryan had only $5 notes. the number of notes Andy had was 80% of Bryan's notes. When Bryan gave Andy $550, the number of notes Andy had became thrice that of Bryan.

a)How many notes did Bryan have at first?
b) How much money did Andy have in the end?

Hi

Good Morning.

Please refer to speedmaths.com's solution.

Best wishes

[tamunawara]

thanks a million but i still have a doubt. Bryan has only $5 notes and therefore he can transfer only five dollar notes. the 550 he transfered should be 110 5 dollar notes. i am not clear about the second part of the solution.

[tianzhu]

tamunawara:

thanks a million but i still have a doubt. Bryan has only $5 notes and therefore he can transfer only five dollar notes. the 550 he transfered should be 110 5 dollar notes. i am not clear about the second part of the solution.

Hi

Please refer to speedmaths.com's solution.

Best wishes