The cuboid container A is 40cm long and 25cm wide, and the cuboid container B is 30cm long and 20cm wide. At this time, the depth of water in B is 20cm. If part of the water in B is poured into A, so that the height of the water in the two containers is the same, the depth of water in B is How many centimeters?
甲长方体容器长40cm，宽25cm，乙长方体容器长30cm，宽20cm，此时乙内水深20cm，若将乙的水倒一部分给甲，使两容器中的水高度相同，这时乙内水深是几厘米？
<gadget id="calculator">30 * 20 * 20</gadget>
<output>12_000</output>

<gadget id="calculator">40 * 25</gadget>
<output>1_000</output>

<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<gadget id="calculator">1_000 + 600</gadget>
<output>1_600</output>

<gadget id="calculator">12_000 / 1_600</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>