A car can cover a distance of 8.6 km on one litre of petrol. How far can it go on 36.5 litres of petrol?

Answer

To solve the problem step by step, we will use the unitary method.

### Step-by-Step Solution:

1. **Understand the Given Information**:
- The car can cover a distance of 8.6 km on 1 litre of petrol.

2. **Determine the Distance for 36.5 Litres**:
- To find out how far the car can go on 36.5 litres of petrol, we will multiply the distance covered by 1 litre by the number of litres (36.5 litres).
- Formula: Distance = Distance per litre × Number of litres
- Therefore, Distance = 8.6 km/litre × 36.5 litres

3. **Perform the Multiplication**:
- Now, we will calculate 8.6 × 36.5.
- To make it easier, we can break it down:
- 8.6 × 36.5 = 8.6 × (30 + 6.5)
- = (8.6 × 30) + (8.6 × 6.5)

4. **Calculate Each Part**:
- First, calculate 8.6 × 30:
- 8.6 × 30 = 258
- Next, calculate 8.6 × 6.5:
- 8.6 × 6.5 = 55.9 (you can do this by multiplying 86 × 65 and then dividing by 10).

5. **Add the Results**:
- Now, add the two results together:
- 258 + 55.9 = 313.9

6. **Final Answer**:
- Therefore, the total distance the car can cover on 36.5 litres of petrol is **313.9 km**.