Dongxiang planted 450 trees in spring last year, with a survival rate of 80%. The survival rate of trees planted in autumn last year was 90%. It is known that 18 more trees died last spring than in autumn. How many trees survived in this township last year?
东乡去年春季植树450棵，成活率为80%，去年秋季植树的成活率为90%，已知去年春季比秋季多死18棵，这个乡去年一共活了多少棵？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">450 * (4/5)</gadget>
<output>360</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">450 * (1/5)</gadget>
<output>90</output>

<gadget id="calculator">90 - 18</gadget>
<output>72</output>

<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">72 / (1/10)</gadget>
<output>720</output>

<gadget id="calculator">720 * (9/10)</gadget>
<output>648</output>

<gadget id="calculator">360 + 648</gadget>
<output>1_008</output>

<result>1_008</result>