Liquid soap

Liquid soap lasted two weeks to one member of the family. How many days will last, if it use:
a) two members
b) 4 members
c) seven members?

Correct result:

a =  7
b =  3.5
c =  2

Solution:

a=14/2=7
b=14/4=72=3.5
c=14/7=2

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