<span>A has earned twice as much as B so: A=2B
B has averaged 50% more than C so: B=C+0.5C
Combined is 220K, So A+B+C=220,000
The last equation can be re-written as: 
2B+1.5C+C=220K 
AND since A=2B, it can be rewritten again as: 
3C+1.5C+C=220K 
Now you can get C
finally, since B=1.5C you can get B, then to get the average, just divide that by 3 (years) and you should be done.
So B = 60000 for 3 years</span>
        
                    
             
        
        
        
Answer:
The sample size required is at least 171
Step-by-step explanation:
We have that to find our  level, that is the subtraction of 1 by the confidence interval divided by 2. So:
 level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of  .
.
So it is z with a pvalue of  , so
, so 
Now, find the margin of error M as such

In which  is the standard deviation of the population and n is the size of the sample.
 is the standard deviation of the population and n is the size of the sample.
What sample size is required? 
A samle size of at least n is required, in which n is found when 
So






Rouding up
The sample size required is at least 171
 
        
             
        
        
        
That’s the answer because I couldn’t type it out! Hope it helped!
 
        
        
        
0.19880716 should be your answer 
Sorry if wrong
        
                    
             
        
        
        
The greatest common factor of 28 and 36 is 4.