Your car petrol usage is 9 litres / 100 km. Your tank holds 68 litres. How many tanks of fuel will you use to drive 1500km?

To find out how many tanks of fuel are needed to drive 1500 km, we need to calculate the total fuel consumption and then determine how many full tanks that amount corresponds to.

### Step 1: Calculate Total Fuel Consumption

Your car uses 9 litres of petrol per 100 km. To find out how much petrol is needed for 1500 km, use the formula:

\[
\text{Fuel needed} = \left(\frac{\text{Fuel usage}}{100}\right) \times \text{Distance}
\]

Substituting the values:

\[
\text{Fuel needed} = \left(\frac{9}{100}\right) \times 1500 = 135 \text{ litres}
\]

### Step 2: Calculate the Number of Tanks Needed

The car's fuel tank holds 68 litres. To find out how many full tanks are required, divide the total fuel needed by the tank capacity:

\[
\text{Number of tanks} = \frac{\text{Fuel needed}}{\text{Tank capacity}} = \frac{135}{68}
\]

Calculating this:

\[
\text{Number of tanks} \approx 1.985
\]

Since you cannot use a fraction of a tank, you will need 2 full tanks to complete the 1500 km journey.

### Final Answer:

**You will need 2 tanks of fuel to drive 1500 km.**

Would you like further details, or do you have any questions?

### Related Questions:
1. How many kilometers can you drive on a full tank?
2. How much would it cost to fill up your tank if petrol costs $1.50 per litre?
3. If you drove 2000 km, how many litres of petrol would you need?
4. What is the cost per kilometer of driving your car?
5. How much petrol would you save if your car's fuel efficiency improved to 7 litres per 100 km?

### Tip:
To improve your car’s fuel efficiency, consider regular maintenance like keeping your tires properly inflated and driving at steady speeds.

Learn how to calculate the number of fuel tanks needed for a 1500 km journey based on a car's petrol usage of 9 litres per 100 km and a tank capacity of 68 litres. This problem involves proportional reasoning and unit conversion. Suitable for Grades 6-8 students.

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