Question

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:
Option 1 : 16 Option 2 : 17 Option 3 : 18 Option 4 : None of these

Answer 1

1/5  : =  4x

 x   = 1/20

4/5 / x    = 1/20

4/5   = 1/20 x

x   =  80/5

= 16

the answer is option 1,  hope this helps