A lorry tank was 4/5 full of petrol when the gauge indicated 72 litres what was the full capacity of the Tank in litre

To find the full capacity of the tank, you can set up a proportion using the information given.

Let x be the full capacity of the tank in litres.

Since the tank was 4/5 full when the gauge indicated 72 litres, we can set up the following proportion:

(4/5)x = 72

To solve for x, multiply both sides by 5 to get rid of the fraction:

4x = 360

Now, divide both sides by 4 to solve for x:

x = 360 / 4
x = 90

Therefore, the full capacity of the tank is 90 litres.