FRACTION PROB #2  

No...they'd both lose money if you have the problem state correctly. I am not sure what you meant by "give her 55 of the amount left with her". My answer is based on her dad giving her only $55 of the total amount she started with...since that seems to be the way it is written.

If Jack starts with $100 and dad give him 5% more...that = $105. Now dad wants to take back 5% of that total...which is $25 so Jack would end up with $80. Total loss, $25.

For Jill, he wants to take 5% of her $100, that would leave her with $95 but he only wants to give her a total of $55 so she would end up with only that. Total loss, $45.

So, both would be wise to take the initial $100 and run like the wind away from their father's wheeling and dealing!

Jack has $100
His dad gives him $5, now he has $105
His dad takes away $5.25, now he has $99.75

Jill has $100
Dad takes away $5, now she has $95
Dad gives her $4.75, now she had $99.75

Neither of them should accept the deal as they would both loose 25 cents (mathematically speaking)
They should accept the deal if their dad needs the cash, besides they're family (family speaking)