Explanation:
total eranings (t) = n of orcestra tickets sold × price + n of balcony tickets sold × price
3640 = 148 x + 76y
orchestra ticket = 3 times as balcony
x = 3y
y =x/3
3640 = 444 y+ 76y
3640 = 520y
y = 7 $ balcony
x = 21 $ orchestra
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