Question 1047778
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Hi  
*[illustration rectangle.png].
Let x represent the constant of proportionality
P = 2L + 2w
2(7x) + 2(4x) = 121cm
22x = 121
x = 5.5 the constant of proportionality
L = 38.5cm {{{7*5.5) }}} and breadth is 22cm {{{4*5.5) }}} 
AND
Checking the Perimeter
77 + 44 = 121  CHECKS!