Question
The figure is not drawn to scale. R and S are two tanks. The base area of R is 42 cm2 while the base area of S is 70 cm2. Tank R and S contained some water and the height of the water level in Tank R was 66 cm as shown. Dan then poured some water from Tank R into Tank S. After that, the height of the water level in both tanks became 28 cm. What was the height of the water level in Tank S at first?
3 m

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The figure is not drawn to scale. R and S are two tanks. The base area of R is 42 cm2 while the base area of S is 70 cm2. Tank R and S contained some water and the height of the water level in Tank R was 66 cm as shown. Dan then poured some water from Tank R into Tank S. After that, the height of the water level in both tanks became 28 cm. What was the height of the water level in Tank S at first?