Xiao Ming reads 400 pages of a book, and reads 70 pages every day. On the third day, what page should he read from?
小明读一本书400页，每天读70页，第3天他应该从第多少页读起．
<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<gadget id="calculator">140 + 1</gadget>
<output>141</output>

<result>141</result>