The talent show of Baoan Foreign Language School took 80.5 minutes for the third grade, 15% more than that of the sixth grade. How many minutes did the sixth grade talent show take?
宝安外国语学校这次才艺展示，三年级80.5分钟，比六年级多15%，六年级才艺展示用了多少分钟？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">80.5 / (23/20)</gadget>
<output>70</output>

<result>70</result>