Two students, Huanhuan and Lele, counted the number of "excellent" math assignments this semester. Huanhuan said: "I got 18 times excellent". Lele said: "You are really good! More than me (1/5)." May I ask how many times Lele got A in math homework this semester?
欢欢和乐乐两位同学在一起统计本学期数学作业得"优"的次数．欢欢说："我得了18次优"．乐乐说："你真行！比我还多(1/5)．"请问乐乐本学期数学作业得优多少次？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">18 / (6/5)</gadget>
<output>15</output>

<result>15</result>