The storage station stores 110 bicycles on a certain day, and receives a storage fee of 1350 yuan in total. According to regulations, the storage fee for each two-seater bicycle is 15 yuan, and the storage fee for ordinary bicycles is 10 yuan. So, how many two-seater bicycles are there in custody today?
保管站某天存放自行车110辆，共收到保管费1350元．按规定双座自行车每辆保管费15元，一般自行车每辆保管费10元．那么，这天来保管的双座自行车有多少辆．
<gadget id="calculator">110 * 10</gadget>
<output>1_100</output>

<gadget id="calculator">1_350 - 1_100</gadget>
<output>250</output>

<gadget id="calculator">15 - 10</gadget>
<output>5</output>

<gadget id="calculator">250 / 5</gadget>
<output>50</output>

<result>50</result>