Tutor MathsGuru: Ask me for your burning Maths questions!

[Vanilla Cake]

clblinym:

I use a software called FastStone Capture. You can download it online.

http://postimage.org/image/214h49lwk/

Thks for your helpful tips, clblinym. Our download version is 6.7 (Unregistered trial version)which is valid for 30 days. Is there any link to download for the free version of this software? Sorry to ask too many questions. My sincere apologies.

BTW, the above qn was posted for testing purpose. There is no need to provide solutions for it. Thks.

[clblinym]

Vanilla Cake:

clblinym:

I use a software called FastStone Capture. You can download it online.

http://postimage.org/image/214h49lwk/

Thks for your helpful tips, clblinym. Our download version is 6.7 (Unregistered trial version)which is valid for 30 days. Is there any link to download for the free version of this software? Sorry to ask too many questions. My sincere apologies.

BTW, the above qn was posted for testing purpose. There is no need to provide solutions for it. Thks.

My organization has bought this software.

Regards,
Amy

[SoWoW]

clblinym:

SoWoW:

i have 2 P5 maths questions to ask the experts here.. Please help


1) A coin box contained some twenty cent and fifty -cent coins in the ratio 4:3. After 20 twenty-cent coins were taken out to exchange for fifty-cent coins of the same value and put back in the box, the ratio of the number of twenty-cent coins to the number of fifty-cent coins became 7:11. find the sum of money in the box.

2) There were 280 people at a concert. 1/4 of the males and 1/5 of the females wore glasses. Given that a total of 60 people wore glasses in the concert, how many females wore glasses?

Dear Sowow,

This is my answer and working for question 1.

20 x 20 cents = $4.00
$4.00/50 cents = 8

20 20-cent coins were taken out.
8 50-cent coins were put in.

At first, ratio was 4:3.
After that, the ratio was 7:11.

4:3 = 8:6

If it was 8:6 at first,
1u is 20,
5u is 8 (wrong)

4:3= 12:9

5u is 20,
2u is 8
(correct)
1u is 4.

The ratio at first was 12:9.

12u is 48.
48 x 20cents = $9.60

9u is 36.
36 x 50cents = $18

$18 + $9.60 is $27.60

Ans: $27.60

Can you check whether $27.60 is the answer please?

Thanks.

Amy

Bingo, you are right....Thank you so much for the working......Happy New year to you.

[SoWoW]

YLH88:

SoWoW:

i have 2 P5 maths questions to ask the experts here.. Please help


2) There were 280 people at a concert. 1/4 of the males and 1/5 of the females wore glasses. Given that a total of 60 people wore glasses in the concert, how many females wore glasses?

Hi SoWoW,

I'm not expert but just trying to help. Please check the answer key if the answer for qn 2 is 40.

For Qn 2,

Total = 280

Total Male = 4u --> male with glasses = 1u, male without glasses = 3u

Total Female = 5p --> female with glasses = 1p, female without glasses = 4p

4u + 5p = 280 --> total no of people
4u = 280 - 5p

1u + 1p = 60 --> total people with glasses
4u + 4p = 240
4u = 240 - 4p

280 - 5p = 240 - 4p
280 - 240 = 5p - 4p
40 = p --> females with glasses

Thank you so much..... Happy New Year

[SoWoW]

clblinym:

SoWoW:

i have 2 P5 maths questions to ask the experts here.. Please help


1) A coin box contained some twenty cent and fifty -cent coins in the ratio 4:3. After 20 twenty-cent coins were taken out to exchange for fifty-cent coins of the same value and put back in the box, the ratio of the number of twenty-cent coins to the number of fifty-cent coins became 7:11. find the sum of money in the box.

2) There were 280 people at a concert. 1/4 of the males and 1/5 of the females wore glasses. Given that a total of 60 people wore glasses in the concert, how many females wore glasses?

Dear SoWow,

This is my answer for the 2nd question.

1/4 of males and 1/5 of females --> 60
4/4 of males and 4/5 of females --> 240
1/5 of females --> 280-240
= 40

1/5 of females (40) wore glasses.


Thanks.

Amy

Amazing, just few steps and you got the answer. thanks

[Daddy]

hi Brenda10,


very sorry. I did not understand the working. any other simplest way of explaining. Thanks

O : P
9 : 5
-240 -200
12 : 5

O 45u 1200
P 60u 2400
Diff 15u = 1200
1u = 80

Oranges Left 9u - 240
720 - 240 = 480

Oranges and pears at first : 14u
14 * 80 = 1120

Thanks answers are correct.

[Daddy]

Hi,


Another ratio problem to solve :? Please help. Thanks

1. 2/5 of P is equal to 3/10 of Q. 1/2 of R is equal to Q. Express P as a simple ratio to R

Thanks

[iFruit]

Daddy:

Hi,


Another ratio problem to solve :? Please help. Thanks

1. 2/5 of P is equal to 3/10 of Q. 1/2 of R is equal to Q. Express P as a simple ratio to R

Thanks

2/5 x P = 3/10 x Q -------------(1)
1/2 x R = Q --------------------(2)

Substituting (2) in (1), we get

2P/5 = 3/10 x (R/2) = 3R/20

after cross multiplying,

P/R = (5x3)/ (2x20) = 3/8

P:R = 3:8


HTH

[Brenda10]

Daddy:

hi Brenda10,


very sorry. I did not understand the working. any other simplest way of explaining. Thanks

O : P
9 : 5 (at First)
-240 -200
12 : 5 (at the end)

O 45u 1200 (9 x 5, 240 x 5)
P 60u 2400 (5 x 12, 200 x 12)
Diff 15u = 1200
1u = 80

Oranges Left 9u - 240
720 - 240 = 480

Oranges and pears at first : 14u
14 * 80 = 1120

Thanks answers are correct.

Hi, this question is so called classifed under \"External Change\" Model.

We have to make the final qty 12 parts and 5 parts equal. As such we have to multiply the entire colum by the same number.

Then we have (9 x 5, 240 x 5) and (5 x 12, 200x 12).

Hopefully you can understand and BTW all these strategies and explanation can be found in some assesssment books.

Happy New Year.

[Dharma]

Daddy:

Hi,


Another ratio problem to solve :? Please help. Thanks

1. 2/5 of P is equal to 3/10 of Q. 1/2 of R is equal to Q. Express P as a simple ratio to R

Thanks

2/5 P = 3/10 Q
P/Q = 3/10 x 5/2 = 3/4
P : Q = 3 : 4

Q = 1/2 R
Q/R = 1/2
Q : R = 1 : 2 = 4 : 8
so, P : R = 3 : 8