Answer :

Sure, let's solve this step-by-step.

1. Understand the given information:
- The cost of 15 litres of petrol is £12.

2. Determine the cost per litre of petrol:
- To find the cost per litre, divide the total cost by the number of litres.

[tex]\[
\text{Cost per litre} = \frac{£12}{15 \text{ litres}} = £0.8 \text{ per litre}
\][/tex]

3. Now, calculate the cost for 20 litres of petrol:
- Multiply the cost per litre by the number of litres you want to find the price for.

[tex]\[
\text{Cost for 20 litres} = £0.8 \text{ per litre} \times 20 \text{ litres} = £16
\][/tex]

So, the cost of 20 litres of petrol is £16.

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Rewritten by : Barada