Answer:
its 273 rounded but say 270
Step-by-step explanation:
 
        
                    
             
        
        
        
Step-by-step explanation:
The easiest approach is to realise that one hour is 3 times longer than 
20
 minutes. The longer the time, the more they will pave.
2
15
 of a mile, in 20 minutes, how much in 60 minutes?#
They will pave 3 times more.
2
15
×
3
1
=
6
15
 of a mile
6
15
=
2
5
 of a mile
You could also use the 'unitary method' where you find out how much they pave in ONE minute (divide by 
20
 ) and them multiply by 
60
 to find how much in one hour.
Look at what happens:
2
15
÷
20
×
60
 
=
2
15
×
1
20
×
60
3
 
=
2
15
×
3
 
←
 exactly the same maths.
=
2
5
 
 
        
                    
             
        
        
        
Try this suggested option, answers are marked with colour.
 
        
             
        
        
        
Answer: 30% of decrease
Step-by-step explanation:
$13.95 - $10 = $3.95
$13.95___100%
$3.95___x= 28.31%
(3.95*100) / 13.95 = 28.31 = 30