数学题：新华书店运来书600本，卖了2天以后，正好卖了这批书的三分之二。已知第一天卖出的本数与这批书总本书的比是二比五，则第二天卖出多少本？请问一下怎么做？

数学题解答：2天卖了这批书的三分之二，那么两天共卖了：

600　×　2/3　＝　400（本）

第一天与总本数的比是2比5，那么第一天卖了：

600　×　2/5　＝　240（本）

所以，第二天卖了：

400　-　240　＝　160（本）

答：第二天卖了160本。

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