Five bottles contain the same amount of water. If 3 kilograms are poured out of each bottle, the total amount of water remaining in the five bottles is exactly the total amount of water in the original three bottles. How much water is in each bottle?
五个瓶子里装着同样多的水，如果从每个瓶中倒出3千克，这样五个瓶子里剩下的水的总量正好是原来3瓶水的总量．每个瓶里原来有水多少千克？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">5 * (3/2)</gadget>
<output>15/2 = around 7.5</output>

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