Water cement ration is, usually, expressed in
(a) Litres of water required per bag of cement
(b) Litres of water required per kg of cement
(c) Both (a) and (b)
(d) None of these
(a) Litres of water required per bag of cement
(b) Litres of water required per kg of cement
(c) Both (a) and (b)
(d) None of these