 <translate> Out of the 400 emails, 1 / 4 * 400 = 100 emails were spam emails. The number of emails that were not spam emails is 400 - 100 = 300. 2 / 5 of the emails which were not spam were promotional emails, a total of 2 / 5 * 300 = 120 emails. If the rest of the emails were important emails, there were 300 - 120 = 180 important emails.
Therefore, the answer is 180. <yor> Lára àwọn imeeli 400 náà, 1 / 4 * 400 = 100 imeeli ni àwọn imeeli tí kò tọ́. Nọmba awọn imeeli ti kii ṣe awọn imeeli àwúrúju jẹ 400 - 100 = 300. 2 / 5 ti awọn imeeli ti ko ni spam jẹ awọn imeeli ipolowo, apapọ ti 2 / 5 * 300 = awọn imeeli 120. Ti awọn iyokù ti awọn imeeli wà pataki imeeli, nibẹ wà 300 - 120 = 180 pataki imeeli. Nítorí náà, ìdáhùn náà ni 180. 