Q&A - P5 Math

[Udon]

Hi MathIzzzFun,


Thank you so much for your time and illustration attached…

[mummyv]

tianzhu:

mummyv:

Sorry am weak in this. Could you explain why 3:2 x 3?
When Sharon's age : Ariel age --> 3:2 --> 9u : 6u
Thanks

Hi

Hope this helps.

Best wishes

http://farm8.staticflickr.com/7187/7115329429_fe4bc6e3b9_z.jpg\">

Thanks a million Tianzhu, now I understand....

[determination0506]

Please help me how to solve this Area of Triangle Math.


The figure below is not drawn to scale. ADF is a triangle and BC = CD. Find the area of triangle ADF. (See Attached)

http://i48.tinypic.com/t688sm.jpg\"> Hi,

The answer is 18 cm square. But I don't understand how it was derive. Please help me. Thank you very much.

Is there anywhere I could learn Area of Triangle, find it very confusing as I not sure where is the base and height for example in this case. Thanks again.

[MathIzzzFun]

determination0506:

Please help me how to solve this Area of Triangle Math.


The figure below is not drawn to scale. ADF is a triangle and BC = CD. Find the area of triangle ADF. (See Attached)

http://i48.tinypic.com/t688sm.jpg\"> Hi,

The answer is 18 cm square. But I don't understand how it was derive. Please help me. Thank you very much.

Is there anywhere I could learn Area of Triangle, find it very confusing as I not sure where is the base and height for example in this case. Thanks again.

Hi
Find Total Area N subtact Area Of Unshaded.

Cheers.

[Michaelia0816]

[quote]Is there anywhere I could learn Area of Triangle, find it very confusing as I not sure where is the base and height for example in this case. Thanks again.[/quote]
Hi, you may refer to your textbook!

[keinic]

Hi


Appreciate if someone could help with the following question:

A class of Chinese and Malay pupils went to the zoo. The ratio of the no of Chinese pupils to the no. of Malay pupils was 10: 7. The ratio of the no.of Malay boys to the no. of Malay girls was 9 :5. What was the ratio of the no. of Malay girls to the no. of Chinese pupils in its simplest form?

My DS’s answer is 1:4 but the answer provided was 1:2. TIA.

[php]

keinic:

Hi


Appreciate if someone could help with the following question:

A class of Chinese and Malay pupils went to the zoo. The ratio of the no of Chinese pupils to the no. of Malay pupils was 10: 7. The ratio of the no.of Malay boys to the no. of Malay girls was 9 :5. What was the ratio of the no. of Malay girls to the no. of Chinese pupils in its simplest form?

My DS's answer is 1:4 but the answer provided was 1:2. TIA.

C : M
10 : 7
x2 : x2
20 : 14

MB : MG
9 : 5 = 14

MG : C
5 : 20
1 : 4

Correct answer : 1 : 4

[keinic]

php:

keinic:

Hi


Appreciate if someone could help with the following question:

A class of Chinese and Malay pupils went to the zoo. The ratio of the no of Chinese pupils to the no. of Malay pupils was 10: 7. The ratio of the no.of Malay boys to the no. of Malay girls was 9 :5. What was the ratio of the no. of Malay girls to the no. of Chinese pupils in its simplest form?

My DS's answer is 1:4 but the answer provided was 1:2. TIA.

C : M
10 : 7
x2 : x2
20 : 14

MB : MG
9 : 5 = 14

MG : C
5 : 20
1 : 4

Correct answer : 1 : 4

:thankyou:

[august24]

MathIzzzFun:

Udon:

Hakim and Suresh had some money in the ratio of 13:8. When they each gave away $133, Hakim will have 4 times as much money as Suresh.

How much did Hakim had at first?

Hi

Q2.. when same quantity is added or removed, the difference will remain the same...

http://i50.tinypic.com/2vwa1dj.png\">

At first, Hakim : Suresh --> 13 : 8 --> 39u : 24u (difference 15u)
In the end, Hakim : Suresh --> 4 : 1 --> 20u : 5u (difference 15u)

So, 19u --> $133, 1u --> 7

39 x 7 = 273

Hakim had $273 at first.

cheers.

Sorry, but I am still confused. Firstly, if Hakim had 39u at first and in the end he had 20u, how is this possible to translate to 19u => $133 since it is a reduction?

Also, when I worked backwards using $273, I am not able to get the final ratio of 4:1. (I end up with Hakim:Suresh, $406:$301).

Please help. Thank you.

[MathIzzzFun]

august24:

MathIzzzFun:

[quote=\"Udon\"]Hakim and Suresh had some money in the ratio of 13:8. When they each gave away $133, Hakim will have 4 times as much money as Suresh.

How much did Hakim had at first?

Hi

Q2.. when same quantity is added or removed, the difference will remain the same...

http://i50.tinypic.com/2vwa1dj.png\">

At first, Hakim : Suresh --> 13 : 8 --> 39u : 24u (difference 15u)
In the end, Hakim : Suresh --> 4 : 1 --> 20u : 5u (difference 15u)

So, 19u --> $133, 1u --> 7

39 x 7 = 273

Hakim had $273 at first.

cheers.

Sorry, but I am still confused. Firstly, if Hakim had 39u at first and in the end he had 20u, how is this possible to translate to 19u => $133 since it is a reduction?

Also, when I worked backwards using $273, I am not able to get the final ratio of 4:1. (I end up with Hakim:Suresh, $406:$301).

Please help. Thank you.[/quote]Hi reduction of 19u = amount given away which is $133.
At first,Hakim:Suresh --> 39u:24u --> 373:168
In the end, Hakim:Suresh--> 20u:5u-->140:35

Cheers.