There were 640 students in Hongqi Primary School last year, which is an increase of (1/8) this year compared to last year. How many students are there this year?
红旗小学去年在校学生有640名，今年比去年增加了(1/8)，今年在校学生有多少人？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 + (1/8)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">640 * (9/8)</gadget>
<output>720</output>

<result>720</result>