Mother bought 1 liter of milk, drank 400 ml, and distributed the rest to 4 children. How many ml per person on average?
妈妈买了1升牛奶，喝了400毫升，剩下的分给4个小朋友，平均每人分多少毫升？
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 400</gadget>
<output>600</output>

<gadget id="calculator">600 / 4</gadget>
<output>150</output>

<result>150</result>