If i have and 85 in my class and retook a test that i originally got a 72 what grade would i need for the average to be enough to make my grade a 90?

Assuming there is no specific percentages in the grade book, you would need a grade of 95 to get your whole grade to 90. You find this out by working backwards starting with 90 to find average. You take 90 times 2 which equals 180 and you subtract 85 from that to get 95! Brainliest?