Li Ming needs to type 500 characters. He typed all (3/5) the first time and all (1/10) the second time. How many characters did he type in total?
李明要打500个字，第一次打了全部的(3/5)，第二次打了全部的(1/10)，两次一共打了多少个字？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">500 * (3/5)</gadget>
<output>300</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">500 * (1/10)</gadget>
<output>50</output>

<gadget id="calculator">300 + 50</gadget>
<output>350</output>

<result>350</result>