Question
The figure is not drawn to scale. K and L are two tanks. The base area of K is 21 cm2 while the base area of L is 42 cm2. Tank K and L contained some water and the height of the water level in Tank K was 40 cm as shown. Dan then poured some water from Tank K into Tank L. After that, the height of the water level in both tanks became 17 cm. What was the height of the water level in Tank L at first?
3 m

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The figure is not drawn to scale. K and L are two tanks. The base area of K is 21 cm2 while the base area of L is 42 cm2. Tank K and L contained some water and the height of the water level in Tank K was 40 cm as shown. Dan then poured some water from Tank K into Tank L. After that, the height of the water level in both tanks became 17 cm. What was the height of the water level in Tank L at first?