The fruit shop shipped 30 boxes of apples and 25 boxes of pears, weighing 975 kg in total. Each box of apples weighs 20 kilograms, how many kilograms does each box of pears weigh?
水果店运来30箱苹果和25箱梨，共重975千克．每箱苹果重20千克，每箱梨重多少千克？
<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<gadget id="calculator">975 - 600</gadget>
<output>375</output>

<gadget id="calculator">375 / 25</gadget>
<output>15</output>

<result>15</result>