On the football tournament ticket cost 45 Kc for standing and 120kč for sitting. Sitting spectators was 1/3 more than standing. The organizers collected a total 12 300 Kc. How many seated and standing seats (spectators)?

Correct result:

a =  60
b =  80


b = (1+1/3)a
45a + 120b = 12300

b = (1+1/3)•a
45•a + 120•b = 12300

4a-3b = 0
45a+120b = 12300

a = 60
b = 80

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