Lan Lan and Tian Tian made origami cranes together. Lan Lan said to Tiantian: "You folded 25% less than me." Tiantian said to Lan Lan: "If you fold 20% to me, I will have 3 more than you." Please count Counting, how many origami cranes did Lan Lan fold?
兰兰和甜甜一起折纸鹤．兰兰对甜甜说："你折的只数比我少25%．"甜甜对兰兰说："如果你折的20%给我，我就比你多3只了．"请你算一算，兰兰折了多少只纸鹤？
<gadget id="calculator">0.2 - 0.8</gadget>
<output>-0.6</output>

<gadget id="calculator">0.75 + (-0.6)</gadget>
<output>0.15</output>

<gadget id="calculator">3 / 0.15</gadget>
<output>20</output>

<result>20</result>