The money in Xiao Ming's body can buy 15 pencils or 5 erasers. He bought 3 pencils first, how many erasers can he buy with the remaining money?
小明身上的钱可以买15支铅笔或5块橡皮，他先买了3支铅笔，剩下的钱可以买多少块橡皮？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 3</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(4/5) / (1/5)</gadget>
<output>4</output>

<result>4</result>