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 calculate how many tanks of fuel you'll use to drive 1500 km, let's break it down:

1. **Determine fuel usage per kilometer:**
   - You use 9 liters of petrol per 100 kilometers.
   - Therefore, per kilometer: $ \frac{9}{100} = 0.09 $ liters per kilometer.

2. **Calculate the total fuel needed for 1500 kilometers:**
   - $ 1500 \times 0.09 = 135 $ liters.

3. **Find how many full tanks are needed:**
   - The fuel tank holds 68 liters.
   - To find how many tanks are required: $ \frac{135}{68} \approx 1.985 $.

Since you can't use a fraction of a tank, you'll need **2 full tanks of fuel** to complete the 1500 km journey.

Would you like more details or have any questions?

### Related Questions:
1. How much fuel would be left in the second tank after the 1500 km journey?
2. If your car’s fuel efficiency improved to 7 liters/100 km, how many tanks would you need for the same trip?
3. How far could you drive with only one full tank?
4. How much would the total fuel cost be if petrol costs $1.50 per liter?
5. What distance can you cover with 50 liters of fuel?

### Tip:
For better fuel efficiency, maintaining steady speeds and reducing unnecessary weight in the car can significantly reduce petrol consumption!

Learn how to calculate the number of tanks of fuel needed for a 1500 km journey. This problem involves basic unit conversion and ratio concepts, suitable for students in Grades 5-7. Understand how to use your car's fuel efficiency to determine petrol requirements for long trips.

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