self Maths Puzzle

A and B is 20% and 30% lesser than c then by wat % B is greater than A??

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self Other Question

if A fills a tank in 30mins,and B fills the same tank in 20mins,and C emptys it in 40min ,if A,B,C works together how much time will the tank take to fill? {(40*40*40)-(36*36*36)}=?