Zhang Li bought 4 pencils and 4 fountain pens, paid 20 yuan in total, got 7.6 yuan back, 1.6 yuan for each pencil, how much is each fountain pen?
张立买来铅笔和水笔各4支，共付20元，找回7.6元，每支铅笔1.6元，每支水笔多少元？
<gadget id="calculator">1.6 * 4</gadget>
<output>6.4</output>

<gadget id="calculator">20 - 7.6 - 6.4</gadget>
<output>6</output>

<gadget id="calculator">6 / 4</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>