Answer:
21.7
Step-by-step explanation:
divide
 
        
             
        
        
        
I believe the answer is 104.
        
             
        
        
        
Answer:
A) 5x-6y=3
B) 7y=2x+8 
B) -2x + 7y = 8  then multiplying "B" by 2.5
B) -5x +17.5y = 20  then adding this to A
A) 5x -6y = 3
11.5y = 23
y = 2
x = 3
Step-by-step explanation:
 
        
             
        
        
        
So, she has 3hrs to grade all papers, for 35 students.. alrite.
the first 5, she does them in 30minutes.. what's the speed rate? well, 5/30 or 1/6
now, she has still 2 hours and a half, or 150 minutes, to do the remaining 30 papers... she has to work at a rate of 30/150 then... which is 1/5 simplified.
now if we take 1/6 as the 100%, what is 1/5 in percentage then?

so 1/5 is 120% in relation to 1/6... meaning the rate of 1/5 she needs to move through, namely 1 paper every 5 minutes, is 20% faster than 1/6.
 
        
        
        
1.55
3/4 and 16/20 equivalent = 3/4 + 16/20 = (?)
