Question
The figure is not drawn to scale. Q and R are two tanks. The base area of Q is 51 cm2 while the base area of R is 50 cm2. Tank Q and R contained some water and the height of the water level in Tank Q was 40 cm as shown. Dan then poured some water from Tank Q into Tank R. After that, the height of the water level in both tanks became 23 cm. What was the height of the water level in Tank R at first?
3 m

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The figure is not drawn to scale. Q and R are two tanks. The base area of Q is 51 cm2 while the base area of R is 50 cm2. Tank Q and R contained some water and the height of the water level in Tank Q was 40 cm as shown. Dan then poured some water from Tank Q into Tank R. After that, the height of the water level in both tanks became 23 cm. What was the height of the water level in Tank R at first?