We know that one inch has 16.5 turns.
To know the number of turns in 2.5 inches of thread, we will simply do a cross multiplication as follows:
number of turns = (2.5 x 16.5) / 1 = 41.25 turns
        
                    
             
        
        
        
Answer:
The number of each kind of apartment in the building is 130  . 
Step-by-step explanation:
Given as :
The total number of floor in a building = 15
The number of apartment on each floor = 26
So, The total number of apartment = 26 × 15 = 390
The number of kinds of apartment in the building is 3 ,  i.e 1-bedroom ,               2-bedroom , 3-bedroom 
Let The number of each kind of apartment in building = x
So, According to question 
The number of each kind of building = 
or, x = 
∴   x = 130
Hence The number of each kind of apartment in the building is 130  . Answer
 
        
             
        
        
        
There are 146 - 84  =  62 girls
ratio is 84:62
simplifies to  42:31
        
             
        
        
        
It’s 6=6 I think I hope it’s help have a nice day