Respuesta :

jessicasyasya

Answer:

19

Step-by-step explanation:

let the smallest square be A, medium square is B and the largest is C ;

as the length side of the main square is 28, we can find that,

A= 28-22 = 6

C= 28-15 = 13

So to find B,

A+B+C = 28

B = 28-A-C

B = 28-6-13 = 9

So the line with questioned mark is,

28-9 = 19

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