The fruit shop shipped 5 boxes of grapes and 5 pears each. The grapes weighed 90 kg and the pears weighed 125 kg. On average, how many kilograms does a box of pears weigh more than a box of grapes? (Answer in two ways.)
水果店运来葡萄和梨各5箱，葡萄重90千克，梨重125千克．平均每箱梨比每箱葡萄重多少千克？(用两种方法解答．)
<gadget id="calculator">125 / 5</gadget>
<output>25</output>

<gadget id="calculator">90 / 5</gadget>
<output>18</output>

<gadget id="calculator">25 - 18</gadget>
<output>7</output>

<result>7</result>