Question

A Blind-folded man is handed a deck of 52 cards and told that exactly 10 of these cards are facing up. He is asked to divide those cards into two piles, each with the same number of cards facing up.

He can't peek, get help, or damage the cards, but may use any strategy that occurs to him to do so.

How can he do it?

Note: Think out of box

Answer 1

What a Puzzle (took 30 min to solve)

Divide the deck into two parts one have 10 cards and other has 42. Node flip all cards of smaller deck, now both the deck has same number of cards which are flipped.

Answer 2

Divide those cards into two piles : 42 and 10.
Turn the 10 cards over.

Answer 3

ANSWER:
The blind-folded man divides the cards into two piles with 10 and 42 cards each.

He then flips all cards in the smaller pile