870 minus the sum of 18 and 47, plus 280, what is the sum?
870减去18与47的和，再加上280，和是多少？
<gadget id="calculator">18 + 47</gadget>
<output>65</output>

<gadget id="calculator">870 - 65</gadget>
<output>805</output>

<gadget id="calculator">805 + 280</gadget>
<output>1_085</output>

<result>1_085</result>