 
<translate> Tun da yake yana bukatar 85 a matsayin matsakaici kuma ya ɗauki gwaje-gwaje biyar, dole ne ya sami 85 * 5 = 425 jimlar maki. A halin yanzu yana da maki 85 + 79 + 92 + 84 = 340. Don haka don gwajinsa na biyar yana bukatar maki 425 - 340 = 85. Amsar ƙarshe: 85. <eng> 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. 