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Răspuns :

x - numarul de biciclisti
x=tricouri albe+tricouri rosii +tricouri albastre
x=30/100·x+20/100·(30/100·x)+320
x=3/10·x+6/100·x+320
100x-36x=32000
64x=32000
x=500
b)tricouri albe=30/100·500=150
c)tricouri rosii=20/100·30/100·50=30
d) P robabilitatea
P=150/500=3/25
P=320/500=16/25