r - orchestra seats
m = main seats
b = balcony seats
2. 40r+30m + 20b=14400
3. 40r/2+30m + 20b=12400
subtract the 3rd from the 2nd:
40r/2=2000 => 20r=2000 => r =100
Now, from the 1st: m+b = 400 => b=400-m
substitute this and the value of r in the 2nd:
or: 4000 + 30m+8000-20m=14400
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