Hongxing Township 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 27 more trees died in the spring last year than in the autumn. How many trees were planted in this township?
红星乡去年春季植树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27棵，这个乡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">450 - 360</gadget>
<output>90</output>

<gadget id="calculator">90 - 27</gadget>
<output>63</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">63 / (1/10)</gadget>
<output>630</output>

<gadget id="calculator">630 * (9/10)</gadget>
<output>567</output>

<gadget id="calculator">360 + 567</gadget>
<output>927</output>

<result>927</result>