A certain elementary school planted 320 trees last year. The number of trees planted this year is (5/4) that of last year. How many trees were planted in two years?
某小学去年植树320棵，今年植树的棵数是去年的(5/4)，两年共植树多少棵？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">320 * (5/4)</gadget>
<output>400</output>

<gadget id="calculator">320 + 400</gadget>
<output>720</output>

<result>720</result>