There are some books on Xiao Ming's bookshelf, the number of books is between 100∽150, among which (2/5) are story books, (1/7) are science and technology books, how many books can be placed on the bookshelf at most.
小明的书架上放着一些书，书的本数在100∽150本之间，其中(2/5)是故事书，(1/7)是科技书，书架上最多放着多少本书．
<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<gadget id="calculator">35 * 4</gadget>
<output>140</output>

<result>140</result>