Xiaofang planned to do 25 math problems on Sunday, but she did it in the morning (3/5), and she did two fewer math problems in the afternoon than in the morning. How many math problems did Xiaofang do in the afternoon?
小芳计划星期天要做25道数学题，结果上午做了(3/5)，下午比上午少做两道，小芳下午做了多少道数学题？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">25 * (3/5)</gadget>
<output>15</output>

<gadget id="calculator">15 - 2</gadget>
<output>13</output>

<result>13</result>