The number of participants in a competition is between 120 and 130, and the ratio of the number of boys and girls is 4:3. How many boys will participate in this competition?
一次竞赛的参赛人数在120至130之间，男女生人数的比4：3，参加这次比赛的男生有多少人．
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">126 * (4/7)</gadget>
<output>72</output>

<result>72</result>