129 kg of washing powder should be divided into small buckets. It is known that each small bucket can hold 0.75 kilograms, and now 120 small buckets have been filled, how many such small buckets are needed for the remaining washing powder?
要把129千克的洗衣粉分装到小桶中．已知每个小桶可以装0.75千克，现在已经装满120个小桶，剩下的洗衣粉还需要多少个这样的小桶？
<gadget id="calculator">0.75 * 120</gadget>
<output>90</output>

<gadget id="calculator">129 - 90</gadget>
<output>39</output>

<gadget id="calculator">39 / 0.75</gadget>
<output>52</output>

<result>52</result>