A farm harvested 18 tons of rice last year, and the corn harvested was 1/4 of the rice. How many tons of corn were harvested last year?
某农场去年收获水稻18吨，收获的玉米是水稻的(1/4)，去年收获玉米多少吨．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">18 * (1/4)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>