In the tree planting activities, the ratio of the number of trees planted in the fourth and fifth grades is 5:7, 100 trees are planted in the fourth grade, how many trees are planted in the fifth grade?
植树活动中，四、五年级植树的棵数比是5：7，四年级植树100棵，五年级植树多少棵？
<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">100 * (7/5)</gadget>
<output>140</output>

<result>140</result>