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The problem of mathematical genius
1) Because a total of ***82 tons are shipped by Party A 5x, shipped by Party C 10( 12-x-y) and shipped by Party B 8y = 82-5x-10 (12-x-y).

Hello, here is the solution:

y= 19-5/2x

2) according to the meaning of the question, y must be greater than or equal to 0, so x is less than or equal to 7, y must be an integer, so x must be an integer multiple of 2.

When x= 2 4 6

y= 14 9 4

Because a *** 12 car, when x=2, y= 14 is already greater than 12, so it does not meet the question.

When x=4

Y=9 doesn't match either.

So finally x=6 y=4 is satisfied.

So a 6 b 4 c 12-4-6=2 cars.