A + B + C = 875 4B + B + (B-25) = 875 <<<---=== One equation for one unknown B 6B - 25 = 875 ====> 6B = 875 + 25 = 900 ====> B == 150. Answer. B has 150 loaves. A has 4*150 = 600 loaves. C has 150-25 = 125 loaves.
This problem is for ONE unknown, and the way to solve it is to reduce it to one unknowns.