Empty barrel

In the backyard is an empty barrel with a volume of 2 hl. How many liters are missing at the edge, when 53 liters flowed into it for 1 day and 68 liters of water for 2 days?

Correct result:

V3 =  79 l


V=2 hll=2 100 l=200 l V1=53 l V2=68 l  V3=VV1V2=2005368=79 lV=2 \ hl \rightarrow l=2 \cdot \ 100 \ l=200 \ l \ \\ V_{1}=53 \ \text{l} \ \\ V_{2}=68 \ \text{l} \ \\ \ \\ V_{3}=V - V_{1}-V_{2}=200 - 53-68=79 \ \text{l}

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