Canister water morning

In the morning, 6 liters more water was in the green canister than in the blue one. In the afternoon, the gardener poured 1 liter of water from the green canister into the blue one. There was then twice as much water in the green canister as in the blue one. How much was in the green can in the morning? How much was in both together?

Final Answer:

a =  9 l
V =  12 l

Step-by-step explanation:

$$\begin{gathered} a=6+b \\ a-1=2\cdot (b+1) \\ a-b=6 \\ a-2b=3 \\ Row2-Row1\to Row2 \\ -b=-3 \\ b=\frac{-3}{-1}=3 \\ a=6+b=6+3=9 \\ a=9 \\ b=3 \end{gathered}$$

$V=a+b=9+3=12\text{l}$

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