36*12=432
432:27=16
(16*1=16)
X * [ 2 ( 3/4 ) - 1 + 1 ( 1/16 ) } = X * [ 2 ( 12/16 ) - 1 + 1 ( 1/16 ) ] =
= X * [ 1 ( 12/16 ) + 1 ( 1/16 ) ] = X * 1 ( 13/16 ) = X * 29/16
X = 32/45
32/45 * 29/16 = 58/45 = 1 ( 13/45 )
1) (77 + 100) * 2 = 354 м - длина всей изгорди
2) 354 : 3,5 ≈ 101,14 = 102 трубы