Enthusiastic Aunt Wang bought (2/5) kg of wool to knit gloves for the children, but there was (1/10) kg of wool left, and (1/10) kg of wool was used for each glove. How many pairs of gloves did Aunt Wang knit?
热心的王阿姨买来(2/5)kg毛线给小朋友织手套，结果还剩(1/10)kg毛线，每幅手套用了(1/10)kg毛线，王阿姨织了多少副手套？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(2/5) - (1/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) / (1/10)</gadget>
<output>3</output>

<result>3</result>