Xiao Ming originally had 30 yuan, and his mother gave him another 50 yuan. Xiao Ming donated (2/5) of the money to the disaster area. How much did he donate?
小明原有30元，妈妈又给了他50元，小明把这些钱的(2/5)捐给了灾区，他捐了多少钱？
<gadget id="calculator">30 + 50</gadget>
<output>80</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">80 * (2/5)</gadget>
<output>32</output>

<result>32</result>