There are 51 students in a class. The ratio of boys to girls is 8:9. How many boys are there?
某班共有学生51名，男生和女的人数比是8：9，男生有多少名．
<gadget id="calculator">8 + 9</gadget>
<output>17</output>

<gadget id="calculator">8 / 17</gadget>
<output>8/17 = around 0.470588</output>

<gadget id="calculator">51 * (8/17)</gadget>
<output>24</output>

<result>24</result>