Dongxiang planted 450 trees last spring, and the survival rate was 80%. The survival rate of the trees planted last autumn was 90%. It is known that 18 more trees died last spring than in autumn. How many trees were planted in this town 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了18棵，这个乡去年一共种活了多少棵树．
<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>