School A has 1680 students, and the number of students in school A is 1/3 more than that of school B. How many students are there in school A than school B?
甲校有学生1680人，甲校的学生比乙校多(1/3)，甲校比乙校多多少人？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">1_680 / (4/3)</gadget>
<output>1_260</output>

<gadget id="calculator">1_680 - 1_260</gadget>
<output>420</output>

<result>420</result>