Answer:   £ 81.38
Step-by-step explanation:
Given: On Monday,
5 builders took  hours  ( i.e.
 hours  ( i.e.  hours )  to build a wall.
 hours )  to build a wall.
On Tuesday, only 2 builders were available.
As workers are inversely proportional to the time if the job remains constant.
Inverse variation equation : 
Let x be the time taken by 2 builders, then


So, 2 builders will take 8.75 hours.
Each paid  £9.30 for each hour.
Then, each builder will be paid for the work completed on Tuesday = £9.30 x  8.75
≈ £ 81.38
Hence, each builder will be paid £ 81.38 for the work completed on Tuesday .
 
        
             
        
        
        
Answer:
3.75
Step-by-step explanation:
4x+9=24
4x=24-9
4x=15
x=15/4
x=3.75
 
        
             
        
        
        
Probably the 36 for 4$, but it also depends on the fluid OZ's of the bottle.
        
                    
             
        
        
        
Final price=original price*(100%- discount 1)(100%-discount 2) 
original price=$40
discount 1=25%⇒         100 - discount 1=100%-25%=75%=75/100=0.75
discount 2=15%⇒         100 - discount 2=100%-12%=85%=85/100=0.85
original price=$40(0.75)(0.85)=$25.5
Answer: $25.5