The average of the three numbers is 80, and the ratio of the three numbers is 2:3:5. What is the largest number among them?
三个数的平均数是80，这三个数的比是2：3：5，其中最大的数是多少．
<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">80 * 3 * (1/2)</gadget>
<output>120</output>

<result>120</result>