On March 12th, our school organized a poplar tree planting activity. Under the careful care of the students, the survival rate was as high as 98%, and only 3 trees failed to survive. How many poplar trees did our school plant in this tree planting activity? Tree?
3月12日，我校组织了种白杨树活动，在同学们的精心呵护下，成活率高达98%，只有3棵没活成，我校在这次植树活动中共栽了多少棵白杨树？
<gadget id="calculator">98 / 100</gadget>
<output>49/50 = around 0.98</output>

<gadget id="calculator">1 - (49/50)</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">3 / (1/50)</gadget>
<output>150</output>

<result>150</result>