Lin Lin has 20 yuan. She used (1/5) to buy food, (1/10) to buy drinks, and the rest (3/8) to buy stationery. How much did she spend on stationery? ?
林琳有20元钱，她用了(1/5)的钱购买食物，(1/10)的钱购买饮料，用剩下钱的(3/8)购买了文具，她买文具用了多少钱？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 - (1/5) - (1/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">20 * (7/10) * (3/8)</gadget>
<output>21/4 = around 5.25</output>

<result>21/4 = around 5.25</result>