The fruit shop shipped 15 baskets of oranges and 12 baskets of apples, weighing 540 kg in total. Each basket of oranges weighs 20 kg, how much does each basket of apples weigh? (solution with equation)
水果店运来15筐桔子和12筐苹果，一共重540千克．每筐桔子重20千克，每筐苹果重多少千克？(用方程解答)
<gadget id="calculator">15 * 20</gadget>
<output>300</output>

<gadget id="calculator">540 - 300</gadget>
<output>240</output>

<gadget id="calculator">240 / 12</gadget>
<output>20</output>

<result>20</result>