If you buy 3 pens and 2 bottles of ink, you need to pay 25.5 yuan. If you buy 5 pens and 3 bottles of ink, you need to pay 41.5 yuan. How much is a bottle of ink?
买3支钢笔和2瓶墨水要付25.5元，如果买5支钢笔3瓶墨水要付41.5，一瓶墨水多少元？
<gadget id="calculator">25.5 * 5</gadget>
<output>127.5</output>

<gadget id="calculator">41.5 * 3</gadget>
<output>124.5</output>

<gadget id="calculator">127.5 - 124.5</gadget>
<output>3</output>

<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">10 - 9</gadget>
<output>1</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<result>3</result>