Answer :

To share 100 in the ratio of 4:1
100:25
AL2006
That means you want to take the  100, and give it to  2  people in a way that
one person has  4  shares, and the other person has  1  share.  Then the
ratio of what the two people have is  4  to  1 .

Think about the shares . . . In order to give  4  shares to one guy and  1  share
to the other one, you need to cut up the  100  into  5  shares.  So each share
has to be ( 100 / 5 ) = 20 .

Then the first guy gets  4  shares  = (4 x 20)  =  80 ,
and the other one gets  1  share  =  20.

The ratio is  80/20  = 4/1 ,  and you've given out the whole (80 + 20)  =100 .