Question

the perimeter of a rectangular swimming pool is 40 m. if its length is 4 m more than its width, find the dimensions of the swimming pool.

Answer 1

perimeter =2(L+B) length =4+B
40m= 2(4+B+B)
40m=8+2B+2B
40-8=2B+2B
32=4B
B=8
Breadth =8
Length =12
==12

verify =2(12+8)
=24+16
=40m

Answer 2

LET THE BREADTH BE B 
ACCORDING TO QUESTION :
LENGTH = 4M GREATER THAN BREADTH = 4M + B
PERIMETER  = 2 ( L+ B )
                          2(4+B+B )
                           8 +2B +2B 
SO 
 8 + 2B +2B = 40
 8 +4 B = 40
4B = 40- 8
4B = 32 
B = 32/ 4
B = 8


SO NOW
BREADTH   = B = 8 M
LENGTH = B+4 = 8+4 = 12M 



VERIFICATION :
2(L+B)
2(8 +12)
16+24 = 40 
HENCE PROVED 


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