42 students from Class 51 went rowing and rented 10 boats in total. Each big boat takes 5 people, and each small boat takes 3 people. How many big boats are you renting?
五1班42名同学去划船，一共租用了10只船．每只大船坐5人，每只小船坐3人．租用的大船有多少只？
<gadget id="calculator">3 * 10</gadget>
<output>30</output>

<gadget id="calculator">42 - 30</gadget>
<output>12</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<result>6</result>