Question

Wafa drove 420 kilometers using 18 liters of gas. At this rate, how many liters of gas would she need to drive 357 kilometers?

Answer 1

15.3 litres

Explanation:

You can do this many different ways, but this is how i did it:

1) I'm going to find how much gas it takes to travel just 1 km.

So, to drive for 1 km, I only need 18/420 litres of gas.

*you can solve this, but you'll just get a really long decimal, so i find it easier just to keep it as a fraction until i'm at the end of solving.

2) Now times the amount of petrol it takes to travel 1 km by 357, to find the final answer.

18/420 x 357 = 15.3 litres

Hope that helped : )