Respuesta :

tonb

Answer:

900 L

Step-by-step explanation:

Let x be the number of litres when the tank is full.

Then 5/6 x - 30 = 4/5 x

Solve this by converting to /30:

25/30 x - 30 = 24/30 x

1/30 x = 30

x = 30*30 = 900

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