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3 years ago sum of ages of all 5 members was 80 years And average was 16 year At present sum of ages of all 5 members and age of baby(x) is 80+(3*5)+x=95+x Average at present is (95+x)/6 =16(Given) 95+x=96 X=96-95=1 Hence age of baby is=x=1 year

A does 1/6 of work in one day B does 1/12 of same work in one day Both of them does (1/6)+(1/12)=1/4 of work in one day Let x be the time taken by both of them to do the whole work So they will take (1*x)/4=1 From here X=4 days Both of them will take 4 days to complete the work

4/5-3/4=1/20 Here value of 5 litre water is 1/20 Then Let x be the capacity of tank So (1*x)/20=5 X/20=5 And from here, X=100 litre Capacity of tank is 100 litre (c) 100