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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.
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:
In the following activity, and in those that follow, the "recipe" that is given is of utmost importance.
1. Increase R250 by the ratio of 2 : 3.
Table:
RATIO | 2 | 3 |
AMOUNT | 250 | a |
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 |
1. A well-known example is: 120 km/h.
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.)
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