Question

A plane flies 405km on 90 liters of fuel .How much fuel is needed for 540km.

Answer 1

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405 km in 90 L

1 km in 90/405 L

540 km in 90/405X 540

120L of petrol

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Answer 2

First we had to find in 1 litre how much km it will run =405/90

                                                                                         =4.5km/litre

Then divide the total km=540 km by 4.5=540/4.5=120

it means that it will need 120 litres of petrol to go 540 km

=120