A, B and C make 940 parts at the same time. A makes one in 5 minutes, 1 / 4 more than B. C makes two / 5 less than B. how many parts do a, B and C make?

A makes one for 5 minutes, 1 / 4 more than B
B make a 5 / (1 + 1 / 4) = 4 minutes
The time of C is 2 / 5 less than that of B
C make a 4 * (1-2 / 5) = 12 / 5 minutes
Every minute a = 1 / 5 B = 1 / 4 C = 5 / 12
A: B: C = 12:15:25
Suppose that a produced 12x, B produced 15x and C produced 25X
12X+15X+25X=940
X=235/13
The calculation is not an integer

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