A car can travel 45 km in 5 liters of petrol how for would it travel in 12 liters of petrol

45/5 = 9 km per liter

12 * 9 = _______ km

5 litres will take you 45 km

1 litre will take you 9 km
so, 12 litres will take you 108 km

or , just use a simple proportion:
5/45 = 12/x
5x = 540
x = 540/5 = 108

If 30 dozens of eggs cost BD 50. Find the cost of 5-dozens of eggs?

To determine how far the car would travel in 12 liters of petrol, we can set up a proportion based on the information given.

Proportion: distance/amount of petrol = constant

Let's calculate the constant by dividing the distance (45 km) by the amount of petrol (5 liters):
Constant = 45 km / 5 liters = 9 km/liter

Now we can use this constant to find the distance the car would travel in 12 liters of petrol:
Distance = constant * amount of petrol
Distance = 9 km/liter * 12 liters = 108 km

Therefore, the car would travel 108 km in 12 liters of petrol.