Xiao Ming reads a 144-page science fiction book, and the ratio of the number of pages he has read to the number of pages he has not read is 5:3. Then I read another 12 pages, how many pages are left?
小明看一本144页的科幻书，已看页数与未看页数的比是5：3．后来又看了12页，还剩多少没有看？
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">144 * (3/8)</gadget>
<output>54</output>

<gadget id="calculator">54 - 12</gadget>
<output>42</output>

<result>42</result>