In a mathematics competition, a total of 70 people from our school won the first, second and third prizes respectively. The ratio of the number of people who won the first and second prizes was 1:5, and the number of people who won the third prize accounted for (4/ 7). How many people won the first prize?
在一次数学竞赛中，我校共有70人分别获一、二、三等奖，其中获一、二等奖的人数比是1：5，获三等奖的人数占获奖总人数的(4/7)．有多少人获一等奖？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">70 * (4/7)</gadget>
<output>40</output>

<gadget id="calculator">70 - 40</gadget>
<output>30</output>

<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">30 * (1/6)</gadget>
<output>5</output>

<result>5</result>