Mingming and Liangliang participated in the shooting competition organized by the class together. Mingming made 21 shots, and the shooting percentage was 70%. How many balls did you hit?
明明和亮亮一起参加班级组织的投篮比赛，明明投中了21个球，投中率为70%，两个人投球的总个数一样，亮亮投中率为80%，亮亮投中了多少个球？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">21 / (7/10)</gadget>
<output>30</output>

<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">30 * (4/5)</gadget>
<output>24</output>

<result>24</result>