There are 381 pages in Elliot’s book.  He has already read 149 pages.  If he reads 20 pages a day for a week, how many pages are still left to be read?
In a week, Elliot will read 20 x 7 = 
<gadget id="calculator">20*7</gadget>
<output>140</output>
140 pages.
Adding the prior readings, he has read a total of 149 + 140 = 
<gadget id="calculator">149+140</gadget>
<output>289</output>
289 pages.
There are 381 - 289 = 
<gadget id="calculator">381-289</gadget>
<output>92</output>
92 pages still left to be read.

<result>92</result>