Estimating and Costing - Engineering

Q1:

The expected out turn of cement concrete 1 : 2 : 4 per mason per day is

A 1.5 m3

B 2.5 m3

C 3.5 m3

D 5.0 m3

ANS:D - 5.0 m3

For 1 cum how many bag of cement?

if 1:2:4 ratio
1 cum =6 bags
that means
5 cum= 30 bags

Can do this work with mason perday? Anyone, please explain me.