A barrel of oil weighs 17.5 kilograms. If half of the oil is used, the weight of the barrel is 10 kilograms. After using half of the remaining oil, how many kilograms does the barrel weigh?
一桶油连桶重17.5千克，用去油的一半好连桶重10千克，再用去剩下的油的一半后，这时连桶重多少千克？
<gadget id="calculator">17.5 - 10</gadget>
<output>7.5</output>

<gadget id="calculator">7.5 / 2</gadget>
<output>3.75</output>

<gadget id="calculator">10 - 3.75</gadget>
<output>6.25</output>

<result>6.25</result>