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if :1 Cu.m concrete =2500 kg
1+2+4=7
then2500 /7 =357 kg cement /50 =7 bags almost .
I agree with expect answers<<<<<<<Thanks
From an experiment and expertise : for concrete of mixture (1:2:4) or concrete of fc" =21 n/mm2
we need6 to7 bags of cement as max.
it is normal concrete it required almost350 kg/cu.m cement
they are six to seven bags of cement in1 cubic meter of concrete with the ratio1:2:4