ballpoint pen is 6 yuan more expensive than an exercise book. It is known that the unit price of an exercise book is (1/5) of the unit price of a ballpoint pen. How much is an exercise book?
一支圆珠笔比一本练习本贵6元，已知练习本的单价是圆珠笔单价的(1/5)．一本练习本多少元？
<gadget id="calculator">1 / 5</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">6 / (4/5)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(15/2) * (1/5)</gadget>
<output>3/2 = around 1.5</output>

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