A set of "Interesting Mathematics Stories" is originally priced at 170 yuan, and the price is reduced (1/10) on Children's Day. How much is the price of this set of books on Children's Day?
一套《趣味数学故事》原价170元，"六一"儿童节降价(1/10)销售，"六一"儿童节那天这套书的价格是多少元？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">170 * (9/10)</gadget>
<output>153</output>

<result>153</result>