I use either 4 books to complete my exercises

[trueheart_205]

When I want to imply that I use whole of four books at one time to complete my exercises.
How could I say "I use both 4 books to complete my exercises "
or "I use either 4 books to complete my exercises " ?

Thanks so much!

 

[5jj]

"I use all 4 books to complete my exercises."

 

[Barb_D]

Not "either" - that's only one of two.
Not "both" - that's two.

I use all four books to complete my exercises.