Answer:
10 days
Step-by-step explanation:
180 - 8x = 160 - 6x
Solve X (which equals to 10 days)
(x = amount of days)
 
        
             
        
        
        
Answer:
It will take them both 24 minutes to mow the lawn if they are working together.
Step-by-step explanation:
Given that Sam can mow a lawn in 40 minutes, and Melissa can mow the same lawn in 80 minutes, to determine how long does it take for both Sam and Melissa to mow the lawn if they are working together, the following calculation must be performed:
1/40 + 1/60 = 1 / X
3X + 2X = 120
X = 120/5
X = 24
Thus, it will take them both 24 minutes to mow the lawn if they are working together.
 
        
             
        
        
        
10% means for every 100 she spend 10 
in 800 there are 8 100 thus she speds 80
or 10% to decimal form is 

 
 
        
        
        
Step-by-step explanation:
Let me know if I typed something wrong