shop has 46 pairs of rubber shoes and cloth shoes, each pair of rubber shoes is 7.5 yuan, and each pair of cloth shoes is 5.9 yuan. After all are sold out, the income of rubber shoes is 10 yuan more than that of cloth shoes. How many pairs of rubber shoes are there?
某商店有胶鞋、布鞋共46双，胶鞋每双7.5元，布鞋每双5.9元，全部卖完以后，胶鞋比布鞋多收入10元，那么胶鞋有多少双？
<gadget id="calculator">271.4 + 10</gadget>
<output>281.4</output>

<gadget id="calculator">7.5 + 5.9</gadget>
<output>13.4</output>

<gadget id="calculator">281.4 / 13.4</gadget>
<output>21</output>

<result>21</result>