The school will plant a batch of saplings, and the survival rate of these saplings is between 75% and 80%. If you want to ensure that 120 trees are planted alive, how many trees should be planted at least.
学校要栽种一批树苗，这批树苗的成活率在75%～80%之间．如果要保证栽活120棵树，至少应栽多少棵．
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 / (3/4)</gadget>
<output>160</output>

<result>160</result>