There are 555 students in the fifth and sixth grades of the experimental primary school, and the sixth grade is 15% less than the fifth grade. How many students are there in the fifth grade?
实验小学五、六年级共有有学生555名，六年级比五年级少15%，五年级有学生多少名？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 + (17/20)</gadget>
<output>37/20 = around 1.85</output>

<gadget id="calculator">555 / (37/20)</gadget>
<output>300</output>

<result>300</result>