During the summer vacation, Xiao Lin read "Journey to the West". He read an average of y pages per week in the first three weeks, and a total of 120 pages in the last four weeks. When y=15, how many pages did he read in these seven weeks?
暑假期间，小林阅读《西游记》，前三周平均每周读y页，后四周共读120页．当y=15时，他这七周一共读了多少页．
<gadget id="calculator">3 * 15</gadget>
<output>45</output>

<gadget id="calculator">45 + 120</gadget>
<output>165</output>

<result>165</result>