The number of girls in the sixth grade of Xishan Primary School used to be 80% of the number of boys. Later, 3 girls were transferred. Now the number of girls is 5/6 of the number of boys. How many people were there in the whole grade?
西山小学六年级原有女生人数是男生人数的80%，后来转来女生3人，现在女生人数是男生人数的(5/6)，原来全级有多少人？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(5/6) - (4/5)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">3 / (1/30)</gadget>
<output>90</output>

<gadget id="calculator">90 * (4/5)</gadget>
<output>72</output>

<gadget id="calculator">90 + 72</gadget>
<output>162</output>

<result>162</result>