 
 <translate> Give the step-by-step reasoning process and then the final answer. Matias is a salesman in a bookstore. He sold 7 books on Tuesday and three times as many on Wednesday. If the sales from Wednesday were tripled on Thursday, how many books did Matias sell during these three days combined? <ibo> Kwuo otú e si atụgharị uche n'isiokwu ahụ, kọwaa nke ọ bụla n'ime ha, ma kwuo ihe bụ azịza ya. Matias bụ onye na-ere ahịa n'otu ụlọ ahịa na-ere akwụkwọ. O rere akwụkwọ 7 na Tuesday na okpukpu atọ karịa na Wednesday. Ọ bụrụ na ahịa ndị e rere n'ụbọchị Wednesday ji okpukpu atọ karịa nke e rere n'ụbọchị Thursday, akwụkwọ ole ka Matias rere n'ụbọchị atọ a jikọtara ọnụ? 