In a family, the father took 1/5 of the cake and he had 4 times as much as others had, then the family members are:

16

17

18

19

let the weight of the cake is 100gm and the father took 1/5 means 20 gm , this 20 gm is 4 times of other had so the other had 5gm now-- so no of other people is 5*x=80 so x=16 and one is father so total no of family members are 17

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