The ratio of male to female students in the sixth grade is 5:4, and there are 80 male students. How many students are there in the sixth grade?
六年级男女生的比是5：4，其中男生有80人，六年级一共有多少人？
<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">80 / (5/9)</gadget>
<output>144</output>

<result>144</result>