Answer:
4
Step-by-step explanation:
19 = 7 + 3r
12 = 3r
4 = r
 
        
                    
             
        
        
        
The answer is 7. You need to use BIDMAS - Brackets Indices Division Multiplication Addition Subtraction
        
             
        
        
        
There are several ways to answer this question and I will use this approach. Since Johnny reads at a ratio of 7:3 it can be stated that for every 10 pages in a book containing 500 pages Johnny will read 7 of those pages. There are 50 groups of 10 in a 500-page book (50 x 10). Take the ration 7:3 times 50 and use the distributive property:  7:3(50) = (7 x 50):(3 x 50) = 350:150. Based on this Johnny has read 350 pages and has 150 pages remaining. 
        
             
        
        
        
4+4+6+6=12+8=20
hope this helps
        
                    
             
        
        
        
Answer:
(6,8)
Step-by-step explanation:
midpoint=(x1+x2)÷2,(y1+y2)÷2
a(4,15) b(8,1)
x=4+8=12÷2=6
y=15+1=16÷2=8
Answer=(6,8)