The fifth grade held a mathematics competition with a total of 20 questions. 5 points for 1 question correctly, 3 points for wrong answer, Luo Jing got 60 points, how many questions did she get right.
五年级举行数学竞赛共20题．做对1题5分，做错扣3分，罗婧得了60分，她做对多少题．
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 - 60</gadget>
<output>40</output>

<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">40 / 8</gadget>
<output>5</output>

<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<result>15</result>