The price of the ruler is 2.5 yuan, which is 0.1 yuan more than 6 times the price of the eraser. How much is the eraser?
尺子的价钱为2.5元，比橡皮的价格的6倍还多0.1元，橡皮多少元？
<gadget id="calculator">2.5 - 0.1</gadget>
<output>2.4</output>

<gadget id="calculator">2.4 / 6</gadget>
<output>0.4</output>

<result>0.4</result>