 <translate> Since wants needs an 85 as an average and he takes five tests, he must have 85 * 5 = 425 total points. Currently he has 85 + 79 + 92 + 84 = 340 points. So for his fifth test he needs 425 - 340 = 85 points.
The final answer: 85. <yor> Níwọ̀n bó ti jẹ́ pé ó fẹ́ kí ìdánwò náà jẹ́ 85 àti pé ó ti ṣe ìdánwò márùn-ún, ó ní láti ní 85 * 5 = 425 nínú gbogbo ìdánwò náà. Lọwọlọwọ o ni 85 + 79 + 92 + 84 = 340 ojuami. Nítorí náà, kó tó lè ṣe ìdánwò karùn-ún, ó nílò 425 - 340 = 85 kókó. Ìdáhùn tí wọ́n fún un níkẹyìn ni pé: 85. 