Math for free a+b+c

 3 supermarkets get everyday a total of 18000 kilos of meat.

First supermarket gets with 2000 kilos less than the second supermarket and with 400kilos less than the third.

1 kilo of meat is 7$ which amount counts each supermarket?

a=b-2000     》   b=a+2000

a=c-400     》   c=a+400


a+a+2000+a+400=18000    》   3a=18000-2000-400  》 a=5200    b=7200    c=5600


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