Questions like these are common up to P5 and P6.
The starting difference between 2 parties is given.
There is an internal transfer and one party is a multiple of the other party at the end.
Similar question type on internal Transfer "here".
Reiney has $100 more than Keith at first.
After Reiney gives Keith $5,
Reiney now has 6 times as much money as Keith.
How much did Reiney have at the end?
If the above question is easy, try to do the more challenging question below.