# The concept of ratio and ratios in their simplest form  (Page 2/3)

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This is how it can be determined:

1.1 The ratio between the Aids Project (AP) and the Helpmekaar Fund (HMF) is 3 : 5.

What does this mean?

The AP will receive R3 for every R5 that the HMF gets.

• Therefore the first step would be to divide R8.

1.3 So we can do the following:

AP : HMF

3 : 5

The AP portion: $\frac{\text{.}\text{.}\text{.}\text{.}\text{.}\text{.}}{\text{.}\text{.}\text{.}\text{.}\text{.}\text{.}}$ to R = ………………………………………

The HMF portion of: $\frac{\text{.}\text{.}\text{.}\text{.}\text{.}\text{.}}{\text{.}\text{.}\text{.}\text{.}\text{.}\text{.}}$ to R …………. = ……………………………

(Use your calculator and round off to the nearest cent where necessary.)

Now try it yourself:

1. Compare each of the following ratios and indicate which one is bigger. Make use of percentages.

1.1 In Zimbabwe, the area of land available to black people as opposed to whites is 1 200 km² : 1,35 km². In South Africa the ratio of land available to black people to white people is 0,95 km² : 135 km².

What is the difference in land ownership between Zimbabwe and S.A. expressed as a percentage?

1.2 38 : 73 and 13 : 43

2. During 2003, the Mathematics HG paper indicated a grand total of 400 marks. A mistake crept in and the paper actually counted out of 375 marks.

2.1 Express the above information as a ratio in its simplest form.

2.2 Use the information in 2.1 to convert the marks of the following learners at the Primrose Private School from a mark out of 375 to a mark out of 400:

a) Sarie Neetling: 215

b) Thabo Nakane: 172

c) Maria Schmidt: 370

2.3 Calculate the average of the marks obtained for the Mathematics HG paper at this school:

## [lo 3.7, 4.1]

In the following activity, and in those that follow, the "recipe" that is given is of utmost importance.

• Recipe for success:
• Always set up a table.
• Always ask: Will the answer be more or less than what is given?

1. Increase R250 by the ratio of 2 : 3.

• Set up a table.
• Question: Where do I put down the R250? Yes, below the ratio of (2), because the amount must be increased to 3. Will the entry below ratio (3) be more or less than R250? Yes, more.
• Now present your information as ratios and calculate the required answer.

Table:

 RATIO 2 3 AMOUNT 250 a
• Present your information as ratios: 2 : 3 = 250 : a
• 2 and R250 must be in the first positions. $\frac{2}{3}$ = $\frac{\text{250}}{a}$
• (Do crosswise multiplication ): 2 x a = 3 x 250
• 2 a = 750
• a = 375

2. Now do the following. Remember the recipe for success:

2.1 Ms Radetski is experiencing financial problems and she decides to ask her domestic helper who has been working 5 days per week to only come to work 2 days per week.

She decides to decrease her domestic worker's present salary of R1 250 per month to the ratio of 5 : 2.

Calculate the domestic worker's adjusted salary.

Table:

 RATIO AMOUNT

The price of a WV Polo is increased in the ratio of 3 : 5 for 2004. What will the price be in 2004 if the price in 2003 is R117 800?

Table:

 RATIO AMOUNT

## [lo 3.7, 4.1]

1. A well-known example is: 120 km/h.

• What is the meaning of it?

2. You drive a distance of 120 km in 2 h. What is your average speed? (km/h means km per hour or km ÷ h.)

do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
it is a goid question and i want to know the answer as well
Maciej
Abigail
Do somebody tell me a best nano engineering book for beginners?
what is fullerene does it is used to make bukky balls
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
for screen printed electrodes ?
SUYASH
What is lattice structure?
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
what's the easiest and fastest way to the synthesize AgNP?
China
Cied
types of nano material
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
what is nano technology
what is system testing?
preparation of nanomaterial
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
what is system testing
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
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