You might have to use some creative thinking for this riddle.
Start with the one which has 4
Take out the 7 and you end up with an 8.
Start with one which has 5
Take out the 7 and you end up with a 4
Start with the one which has 4.
Take out the 7 and you end up with a 2
Start with the one which has 5.
Take out the 7 and you end up with a 1.
What am I starting with? Four answers.
No partial answers please.
Hint
What letter can be inverted to get a number