Xiao Ming reads a story book, and reads the whole book (1/15) every day. After reading it for 5 days, what fraction of the whole book is left?
小明看一本故事书，每天看全书的(1/15)，看了5天，还剩全书的几分之几？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 5</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>