Q&A - P5 Math

[Trina]

Please assist with this question:


There are 40 pupils in a class. Each boy donated $3 and each girl donated $2. The boys donated $30 more than the girls.
How many boys are there?
How many girls are there?

Thanks!

[MathIzzzFun]

Sharmum:

Hi,


Please help....

Q1) Limeng is 10 years old and his sister is 7 years old . In how many years' time will their total age be 41 years?

Q2) A basket with 65 sweets has a mass of 3200g . The same basket with 40 sweets has a mass of 2125g. Each sweet has the same mass . What is the mass of the basket?


Many thanks!

Q1.
Total age now --> 10+7=17
(41-17)/2 = 12 ...(both grow older by the same number of years)
Their total age will be 41 years in 12 years' time.

Q2.

Mass of (65-40)= 25 sweets --> 3200g - 2125g = 1075g
mass of 1 sweet --> 43g
Mass of basket --> 2125g - 40 x 43g = 405g

cheers.

[elisammom]

tianzhu:

elisammom:

Hi pls help. This is the 2011 CA1 Nanhua paper

http://i46.tinypic.com/29bo9ro.jpg\">
TIA

Hi
You may use \"Listing\"

Total number of students for A, C,D and E ------- 77

Find multiples of 5 and 7 after 77

Multiples of 5 ------ 80,85,90,95

Multiples of 5 + 1 ------ 81,86,91,96

Multiples of 7 ------ 84, 91

Multiples of 7 + 5 ------ 89, 96

The common number is 96

Least number of students in B ------- 96-77 ------- 19

Hope this helps

Best wishes

Very clear! Thanks a lot!

[MathIzzzFun]

Trina:

Please assist with this question:


There are 40 pupils in a class. Each boy donated $3 and each girl donated $2. The boys donated $30 more than the girls.
How many boys are there?
How many girls are there?

Thanks!

Assume all boys donated, total amount --> 40 x $3 = $120
$120 - $30 = $90 --- excess amount to be reduced by girls' donation
Number of girls = $90/($3+$2) = 18
Number of boys = 40-18 = 22

cheers.

[Trina]

MathIzzzFun:

Trina:

Please assist with this question:


There are 40 pupils in a class. Each boy donated $3 and each girl donated $2. The boys donated $30 more than the girls.
How many boys are there?
How many girls are there?

Thanks!

Assume all boys donated, total amount --> 40 x $3 = $120
$120 - $30 = $90 --- excess amount to be reduced by girls' donation
Number of girls = $90/($3+$2) = 18
Number of boys = 40-18 = 22

cheers.

Thanks but still dont get it.. Can provide narration? Thanks

[ttyh]

Luke had $140 and Issac had $92 at first. After they spent an equal amount of money, Luke had 4 times as much money as Isaac. How much did each of them spend?

(not sure if this has been asked before, pls refer me to correct page. Thanks!)

[php]

ttyh:

Luke had $140 and Issac had $92 at first. After they spent an equal amount of money, Luke had 4 times as much money as Isaac. How much did each of them spend?

(not sure if this has been asked before, pls refer me to correct page. Thanks!)

3 units -> $140 - $92 = $48
1 unit -> $48 / 3 = $16

$92 - $16 = $76

Each of them spent $76

[Trevortan]

If you need the whole answer key, I don't think I could help. But if you just need some answers from the answer key, then you can go to the website. http://www.onsponge.com/shop/online-solutions.html

Hope I helped

[Oracle]

Serene, Fabian and Eileen shared their prize money of $4100 among themselves. Twice of Serene’s share was equal to 5 times of Fabian’s share. 4 times of Serene’s share was also equal to 3 times of Eileen’s share. Calculate Serene’s share.


Help … please. How should the answers be presented and is this really a P5 appropriate question?

Thank you very much.

[speedmaths.012624com]

Oracle:

Serene, Fabian and Eileen shared their prize money of $4100 among themselves. Twice of Serene's share was equal to 5 times of Fabian's share. 4 times of Serene's share was also equal to 3 times of Eileen's share. Calculate Serene's share.


Help ...... please. How should the answers be presented and is this really a P5 appropriate question?

Thank you very much.

Hi Oracle,

One Possible Solution:

Twice of Serene's share was equal to 5 times of Fabian's share.
This means that ratio of Serene's share to Fabian's share is 5:2
(Just interchange the 2 numbers)

4 times of Serene's share was also equal to 3 times of Eileen's share.
This means that ratio of Serene's share to Eileen's share is 3:4
(Just interchange the 2 numbers)

Ratio of Serene's share to Fabian's share is 5:2
Ratio of Serene's share to Eileen's share is 3:4

Ratio of Serene's share to Fabian's share to Eileen's share is 15:6:20

15 + 6 + 20 = 41 units
41 units = $4100

Can you work from here?

Cheers


speedmaths.com

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