Question
The figure is not drawn to scale. C and D are two tanks. The base area of C is 11 cm2 while the base area of D is 55 cm2. Tank C and D contained some water and the height of the water level in Tank C was 67 cm as shown. Dan then poured some water from Tank C into Tank D. After that, the height of the water level in both tanks became 16 cm. What was the height of the water level in Tank D at first?
3 m

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The figure is not drawn to scale. C and D are two tanks. The base area of C is 11 cm2 while the base area of D is 55 cm2. Tank C and D contained some water and the height of the water level in Tank C was 67 cm as shown. Dan then poured some water from Tank C into Tank D. After that, the height of the water level in both tanks became 16 cm. What was the height of the water level in Tank D at first?