The usual proportion of ingredients in plain cement concrete is -

Portland cement (1 part), clean sand (1 and half to 8 parts) abd coarse aggregate (3 to 16 parts)

Portland cement (1 part), clean sand (3 to 16 parts) and coarse aggregate (1 and half to 8 parts)

Portland cement (1 part), clean sand and coarse aggregate ( 1 and half to 8 parts)

any one of the above