Question

1. Find the way to do it
2. Find the way in which you can do it
3. Find the way in which to do it.
(Can we use all the expressions? Are they the same?)

4. Give me the money to buy food.
5. Give me the money with which you may buy food.
6. Give me the money with which to buy food.
(Can we use all the expressions? Are they the same?)

Answer 1

1-3 all mean the same thing, but 2 and 3 are using extra (unneeded) words. 3 would be less wordy than 2, but 1 is best.

4 and 6 are the same, but 6 is wordy. 5 means someone else (not "me") is going to buy the food.