Question
The figure is not drawn to scale. Y and Z are two tanks. The base area of Y is 18 cm2 while the base area of Z is 40 cm2. Tank Y and Z contained some water and the height of the water level in Tank Y was 40 cm as shown. Dan then poured some water from Tank Y into Tank Z. After that, the height of the water level in both tanks became 29 cm. What was the height of the water level in Tank Z at first?
3 m

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The figure is not drawn to scale. Y and Z are two tanks. The base area of Y is 18 cm2 while the base area of Z is 40 cm2. Tank Y and Z contained some water and the height of the water level in Tank Y was 40 cm as shown. Dan then poured some water from Tank Y into Tank Z. After that, the height of the water level in both tanks became 29 cm. What was the height of the water level in Tank Z at first?