Xiao Ming pours 4 cups of water into a bucket, with the bucket weighing 2 kg, and pours 12 cups of water, with the bucket weighing 7800 grams. How much does each glass of water weigh?
小明往一个桶里倒入4杯水，连桶重2千克，倒入12杯水，连桶重7800克．每杯水有多重？
<gadget id="calculator">2 * 1_000</gadget>
<output>2_000</output>

<gadget id="calculator">7_800 - 2_000</gadget>
<output>5_800</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">5_800 / 8</gadget>
<output>725</output>

<result>725</result>