On the Arbor Day of a certain elementary school, 105 trees were planted in the sixth grade, and 1.4 times the number of trees planted in the fifth grade. How many trees were planted in the fifth grade?
某小学植树节，六年级植树105棵，五年级植树的棵数是六年级的1.4倍，五年级植树多少棵？
<gadget id="calculator">105 * 1.4</gadget>
<output>147</output>

<result>147</result>