One night, Xiaojie spent (5/12) hours reviewing Chinese, 20 minutes reviewing mathematics, and 0.5 hour reviewing English. How much time did he spend reviewing the three subjects?
某天晚上小杰花(5/12)小时复习语文，花20分钟复习数学，花0.5小时复习英语，复习三门功课共花了多少时间？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/12) + (1/3) + 0.5</gadget>
<output>1.25</output>

<result>1.25</result>