The children's shoe store shipped 6 boxes of children's shoes, each with 10 pairs, and sold them for a total of 900 yuan. How much is each pair of children's shoes?
童鞋店运来6箱童鞋，每箱10双，一共卖了900元，每双童鞋多少元？
<gadget id="calculator">6 * 10</gadget>
<output>60</output>

<gadget id="calculator">900 / 60</gadget>
<output>15</output>

<result>15</result>