Answer to Question #129601 in Algebra for Sphesihle Zuma

Question

1.4. Calculate the following
1.4.2. How much will 12 litre juice cost if 1.5 litre costs R24? (3)
1.4.3. Pam poured R240 petrol at a price of R15/litre. How many litres did she pour

Answer 1

1.4.2. Let $x=$ the cost of 12 litre juice. We have a proportion

$$\dfrac{x}{12}=\dfrac{R24}{1.5}$$

$$x=\dfrac{12}{1.5}\cdot R24$$

$$x=R192$$

12 litre juice costs R192.

1.4.3. Let $x=$ the number of litres she poured. Use the ratio

$$x=\dfrac{R240}{R15/litre}=16\ litres$$

Pam poured 16 litres of petrol.