Aunt Wang buys back a batch of children's shoes and sells them at a price of 46 yuan per pair after increasing the price by 15%. What is the purchase price of this kind of children's shoes?
王阿姨购回一批儿童鞋，加价15%后定价出售，每双46元，这种儿童鞋的进价是多少．
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 + (3/20)</gadget>
<output>23/20 = around 1.15</output>

<gadget id="calculator">46 / (23/20)</gadget>
<output>40</output>

<result>40</result>