The stress developed in concrete and steel in reinforced concrete beam 25cm width and 70cm effective depth are 62.5 kg/cm2 and 250 kg/cm2 respectively. If m=15, the depth of its neutral axis is

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The stress developed in concrete and steel in reinforced concrete beam 25cm width and 70cm effective depth are 62.5 kg/cm2 and 250 kg/cm2 respectively. If m=15, the depth of its neutral axis is

a) 20 cm

b) 25 cm

c) 30 cm

d) 55 cm   (Ans)