There are 4500 tons of coal in pile a, B and C. when 20 tons are taken out of pile a and put into pile B, and 30 tons are taken out of pile C and put into pile B, the quality of coal in pile a is less than that in pile B One eighth of the coal in pile C is two seventh more than that in pile A. how many tons of coal were there in pile a, B and C

There are 4500 tons of coal in pile a, B and C. when 20 tons are taken out of pile a and put into pile B, and 30 tons are taken out of pile C and put into pile B, the quality of coal in pile a is less than that in pile B One eighth of the coal in pile C is two seventh more than that in pile A. how many tons of coal were there in pile a, B and C

If pile a has x tons and pile B has y tons, then pile B has 4500-x-y tons
（x-20)/（y+50）=1-1/8
（4500-x-y-30）/（x-20）=1+2/7
x=1332.5
y=1450
A 1332.5 tons
B 1450 tons
C 1717.5 tons

There are 4800 tons of coal in the third pile of a, B and C. 20 tons are taken from a and put into B. 30 tons are taken from C. After putting into B, the coal of a is 1 / 8 less than that of B, and that of C is 2 / 7 more than that of A. how many are there in a, B and C

Let a, B and C be x, y and Z tons respectively. From the meaning of the title, we can get 8 / 7 [x-20] = y + 50, 9 / 7 [x-20] = Z-30, because x-20 + y + 50 + Z-30 = 4800, so 8 / 7 [x-20] + 9 / 7 [x-20] + x-20 = 4800, x = 1420, because 8 / 7 [x-20] = y + 50, so y = 1550, because 9 / 7 [x-20] = Z-30, so z = 1830, so a = 1420 tons, B = 1550 tons, C = 1830 tons