The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm2 and 250 kg/cm 2 respectively. If m = 15, the depth of its neutral axis is_______________?
(A) 20 cm
(B) 25 cm
(C) 30 cm
(D) 35 cm
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