Yimin Primary School planted 200 trees. Among them, (1/5) was planted in the fifth grade, and (1/4) was planted in the fourth grade. How many trees were planted in the fourth and fifth grades?
益民小学植树200棵．其中(1/5)是五年级种的，(1/4)是四年级种的，四、五年级一共植了多少棵树？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">200 * (9/20)</gadget>
<output>90</output>

<result>90</result>