Xiao Ming did 15 math problems, got one wrong, and how many of them got it right.
小明做了15个数学题，做错了一个，做对的占总数的多少．
<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">14 / 15</gadget>
<output>14/15 = around 0.933333</output>

<result>14/15 = around 0.933333</result>