In the school essay activity, 40 students in the sixth grade won the first, second and third prizes. Among them, the number of winners of the third prize accounted for (5/8) of the number of winners in the sixth grade, and the ratio of the number of winners of the first and second prizes was 1:4. How many people in the sixth grade won the first prize?
在校征文活动中，六年级有40人获一、二、三等奖．其中获三等奖的人数占六年级获奖人数的(5/8)，获一、二等奖的人数比是1：4．六年级有几人获一等奖？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 + 4</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">40 * (3/8) * (1/5)</gadget>
<output>3</output>

<result>3</result>