85 x 3 = 255
first 2 test grades were 81 and 86:
81 + 86 = 167
Need to find the 3rd to have exact average 85:
255 - 167 = 88
So her 3rd test needs to make 88 to make average of 85
Double check: 81 + 86 + 88 = 255 = 85 + 85 + 85
Subtract magazine from total:
25 -5 = 20
Divide by number of erasers:
20/4 = 5
Each eraser cost $5
33/35 is the answer because you first subtract which gives you 1/14 then you multiply which gives you 1/7 then finally you add which gives you 33/35
The answer is 3. Hope this helps and pls give thanks!
Answer: 8/5
Step-by-step explanation: I hope this helps!!!!
