bonjour,

Adrien  = x

Romuald  = x + 3

Samir  = 2 ( x + 3 ) = 2 x + 6

Morgan  =  x - 1.5

x + x + 3 + 2 x + 6 + x - 1.5 = 36.50

5 x = 36.50 - 3 - 6 + 1.5

5 x =   29

x = 5.80

Adrien  = 5.80

Romuald = 8.80

Samir = 17.6

Morgan = 5.8 - 1.5 = 4.3