Arbor Day, Class 1 and Class 2 planted 100 trees in total, Class 1 and Class 3 planted 120 trees, Class 1 accounted for 3/7 of the total number of classes (3/7), and classes 3 planted trees in total How many?
植树节，六1班和六2班共植树100棵，六1班和六3班共植树120棵，六1班植树棵数占三个班总数的(3/7)，三个班共植树多少棵？
<gadget id="calculator">100 + 120</gadget>
<output>220</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 + (3/7)</gadget>
<output>10/7 = around 1.428571</output>

<gadget id="calculator">220 / (10/7)</gadget>
<output>154</output>

<result>154</result>