Math CentralQuandaries & Queries


Question from Omokayode, a teacher:

A vehicle tank was 3/5 full of petrol. When 21 litres of fuel was added it was 5/6 full. How many litres of petrol can the tank hold?

Hi Omokayode,

The fraction of a full tank that was added was $\frac56 - \frac35 .$ This fraction of a full tank is 21 liters. How many liters are in a full tank?


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