The number of the school chorus is between 40 and 60, and the ratio of boys to girls is 7:6. How many boys are there in the chorus?
学校合唱队人数在40至60人之间，男生与女生的人数比是7：6，合唱队中男生有多少人．
<gadget id="calculator">7 + 6</gadget>
<output>13</output>

<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">52 * (7/13)</gadget>
<output>28</output>

<result>28</result>