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 solve this, we need to calculate the total fuel required for 1500 km, then determine how many full tanks this would take.

1. **Fuel consumption rate**: 9 litres per 100 km.
2. **Distance to travel**: 1500 km.

First, calculate the total fuel needed for 1500 km:
\[
\frac{9 \, \text{litres}}{100 \, \text{km}} \times 1500 \, \text{km} = 135 \, \text{litres}
\]

Now, calculate how many full tanks are needed:
\[
\frac{135 \, \text{litres}}{68 \, \text{litres/tank}} \approx 1.99 \, \text{tanks}
\]

Thus, you will need **2 full tanks of fuel** to drive 1500 km (since you can't use a fraction of a tank).

Would you like more details on any step or have further questions?

Here are 5 related questions:
1. What if the fuel efficiency improves to 7 litres/100 km? How many tanks will you need?
2. How much fuel would be left in the tank after driving 1500 km with a 68-litre tank?
3. What is the maximum distance you can drive with a full tank (68 litres)?
4. If you increase the distance to 2000 km, how many tanks would you need?
5. How much fuel is required for a 500 km journey?

**Tip**: Improving your car’s fuel efficiency by reducing speed and keeping tires properly inflated can save fuel on long journeys.

Discover how to calculate the number of fuel tanks required to drive 1500 km, given a fuel consumption rate of 9 litres per 100 km and a tank capacity of 68 litres. This problem involves proportion calculations and unit conversion. Suitable for students in Grades 6-8.

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