EXAMPLE:
A car can travel 350 km with 50 litres of petrol. How far would it be if the car was only filled with 20 litres of petrol?
SOLUTION:
50 litres = 350 km 20 litres = ___ km
\(\frac{350 \text{ km}}{50\text{ liter}}=\frac{?}{20\text{ liter}}\)
\(\frac{350}{50}\times{20}=140\)
20 litres = 140 km
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