###Human: Lauren sent 65 pieces of mail on Monday, 10 more pieces of mail on Tuesday than on Monday, 5 fewer on Wednesday than on Tuesday, and 15 more pieces of mail on Thursday than on Wednesday. How many pieces of mail did Lauren send?, ### Assistant: Lauren sent 65 + 10 = 75 pieces of mail on Tuesday.
He sent 75 - 5 = 70 pieces of mail on Wednesday.
And sent 70 + 15 = 85 pieces of mail on Thursday.
Therefore, he sent 65 + 75 + 70 + 85 = 295 pieces of mail. 
 So the answer is :  295