The school carried out tree planting activities. 350 trees were planted in the sixth grade, the number of trees planted in the fifth grade was that of the sixth grade (4/7), the number of trees planted in the fourth grade was less than that of the fifth grade (3/8), how many trees were planted in the fourth grade?
学校开展植树活动，六年级植树350棵，五年级植树的棵数是六年级的(4/7)，四年级植的棵数比五年级少(3/8)，四年级植树多少棵？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">350 * (4/7) * (5/8)</gadget>
<output>125</output>

<result>125</result>