The answer is
x=9
Work: 6/54=9
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Solve the equation 7x-1=15 where x is the cost of each bundle of drawing sheets. 
15-1=14
14/7=2
Each bundle cost $2
        
             
        
        
        
The unit rate is 0.25 kilograms per year.
Step-by-step explanation:
Lets define unit rate first
Unit rate is the change in quantity per unit time.
Given
Weight = w = 5 kg
Time = t  = 20 years
So,

Hence,
The unit rate is 0.25 kilograms per year.
Keywords: Unit rate, rate of change
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