Answer:
The number of pipes to be cut from total length of pipe is 10 pipes 
Explanation:
Given as :
Total length of pipe = l = 7
 foot
 foot 
i.e ' = 
 foot
 foot
The length of pipe to be cut = l' = 
 foot
 foot
Let The number of pipes to be cut = n pipes 
According to question
The number of pipes to be cut = 

i.e n = 

Or, n = 

Or, n = 

or, n = 5 × 2
∴ n = 10 pipes
So, The number of pipes to be cut = n = 10 pipes 
Hence, The number of pipes to be cut from total length of pipe is 10 pipes Answer