A book has 270 pages in total. Wang Qiang read 78 pages in the first 3 days and 20 pages a day in the next 4 days. How many pages did he read in total?
一本书共270页，王强前3天看了78页，后4天每天看20页．他一共看了多少页？
<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">78 + 80</gadget>
<output>158</output>

<result>158</result>