Q&A - P5 Math

[tianzhu]

bookwormkids:

Hi tianzhu,


Could you pls show how to arrive at \"$630 and $1120\" for teddy bears and toy guns? Thanks for your time.

Hi

She spent $1750 altogether. The total cost of toy guns was $490 more than the total cost of teddy bears.

Amount spent on teddy bears ----- (1750 - 490)/2 = 630

Amount spent on toy guns ----- 1750 - 630 = 1120

Best wishes

[bookwormkids]

Thanks for your help, tianzhu.

[Applelyn1]

Hi, need solution for the math question below:


At Baba Shopping center, 1/8 of the patrons are children. The ratio of the no. of men to the no. of women is 5:9. The ratio of the no. of boys to the no. of girls is 2:3.
a) What is the ratio of the no. of children to the no. of men to the no. of women?
b) There are 360 more women than men. How many boys were there at the shopping center?

Thanks.

[MathIzzzFun]

Applelyn1:

Hi, need solution for the math question below:


At Baba Shopping center, 1/8 of the patrons are children. The ratio of the no. of men to the no. of women is 5:9. The ratio of the no. of boys to the no. of girls is 2:3.
a) What is the ratio of the no. of children to the no. of men to the no. of women?
b) There are 360 more women than men. How many boys were there at the shopping center?

Thanks.

Hi

Children : Adults --> 1:7 = 10u :70u
Boys :Girls : Men Women = 4u:6u:25u:45u
(Boys --> 2/5*10u = 4u, Men --> 5/14*70u = 25u)
.. with these, you should be able to complete the rest.

cheers.

[Applelyn1]

MathIzzzFun:

Applelyn1:

Hi, need solution for the math question below:


At Baba Shopping center, 1/8 of the patrons are children. The ratio of the no. of men to the no. of women is 5:9. The ratio of the no. of boys to the no. of girls is 2:3.
a) What is the ratio of the no. of children to the no. of men to the no. of women?
b) There are 360 more women than men. How many boys were there at the shopping center?

Thanks.

Hi

Children : Adults --> 1:7 = 10u :70u
Boys :Girls : Men Women = 4u:6u:25u:45u
(Boys --> 2/5*10u = 4u, Men --> 5/14*70u = 25u)
.. with these, you should be able to complete the rest.

cheers.

Thanks! MathIzzzFun

[simple88]

Hi,


Can someone help me with the following question? Besides using the guess and check method, is there any other method that is less time consuming?

Mr Gopal purchased a certain number of shirts. He bought 11 small-sized shirts at $24 each and the large-sized shirts at $27 each. If the average cost of all the shirts was $25.35, how many large-sized shirts did he buy?

Thank you in advance.

[MathIzzzFun]

simple88:

Hi,


Can someone help me with the following question? Besides using the guess and check method, is there any other method that is less time consuming?

Mr Gopal purchased a certain number of shirts. He bought 11 small-sized shirts at $24 each and the large-sized shirts at $27 each. If the average cost of all the shirts was $25.35, how many large-sized shirts did he buy?

Thank you in advance.

hi

one simple way is to use the area model ...

http://i49.tinypic.com/724ysl.png\">

cheers.

[simple88]

Dear MathIzzzFun,


Thank you so much for your help.

[SAHMwith2boys]

MathIzzzFun:

SAHMwith2boys:

Hi, need solution for the math question below:


The average thickness of 3 identical books is 5mm thicker than the average thickness of 2 magazines. Find the thickness of a book if the average thickness of the books and magazines is 12mm.

Thanks.

Hi
Total thickness = 5 x 12mm = 60mm
Thickness of each book = (60 mm + 5mm x 2)/5 = 14 mm

http://www.flickr.com/photos/62167097@N02/7463411044/in/photostream

cheers.

Thanks for the solution.

[SAHMwith2boys]

Xiao Hu:

SAHMwith2boys:

Hi, need solution for the math question below:


The average thickness of 3 identical books is 5mm thicker than the average thickness of 2 magazines. Find the thickness of a book if the average thickness of the books and magazines is 12mm.

Thanks.

Hi,
B= average thickness of the 3 books.
M= average thickness of the 2 mags.
B-M=5 ---(1)

Average thickness of 3 books and 2 mags:
(3B+2M)/5=12
3B+2M=60 ---(2)

Solve by eliminating M:
(1)*2: 2B-2M=10 ---(3)
(2)+(3): 5B = 70
B=14mm

Hope it helps.
May I know where is this question from?

Rgds,
Xiaohu

Thanks for your solution. The question was from an assessment book that DS was working on.