After a number is enlarged by 3 times, it is increased by 190, then reduced by 4 times, and then subtracted by 20 to get 170. What is the original number?
一个数扩大3倍后，再增加190，然后缩小4倍，再减去20得170，这个数原来是多少？
<gadget id="calculator">190 / 4</gadget>
<output>95/2 = around 47.5</output>

<gadget id="calculator">170 - (95/2)</gadget>
<output>245/2 = around 122.5</output>

<gadget id="calculator">20 + (245/2)</gadget>
<output>285/2 = around 142.5</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(285/2) / (3/4)</gadget>
<output>190</output>

<result>190</result>