School A has 120 more students than school B. The ratio of the number of students between school A and school B is 7:5. How many students are there in school A?
甲校学生比乙校学生多120人，甲、乙两校的学生人数比是7：5，甲校有多少人？
<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">(7/5) - 1</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">120 / (2/5)</gadget>
<output>300</output>

<gadget id="calculator">300 + 120</gadget>
<output>420</output>

<result>420</result>