A middle school in our city donated books to Hope Primary School. The sixth grade teachers and students donated 150 books, and the seventh grade was less than the sixth grade (2/15). How many books were donated by the teachers and students of the two grades?
我市某中学向希望小学捐书，六年级师生共捐书150本，七年级比六年级少娟了(2/15)，两个年级的师生共捐书多少本？
<gadget id="calculator">2 / 15</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 - (2/15)</gadget>
<output>13/15 = around 0.866667</output>

<gadget id="calculator">150 * (13/15)</gadget>
<output>130</output>

<gadget id="calculator">150 + 130</gadget>
<output>280</output>

<result>280</result>