There are 420 boys in Hongxing Primary School, and the number of girls is male (6/7). How many students are there in Hongxing Primary School?
红星小学有男生420人，女生人数是男生的(6/7)，红星小学一共有学生多少人？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 + (6/7)</gadget>
<output>13/7 = around 1.857143</output>

<gadget id="calculator">420 * (13/7)</gadget>
<output>780</output>

<result>780</result>