The widow in the book of Luke how many coins did she put in the temple treasury?

Two coins of the lowest denomination possible, equivalent to about a farthing combined:-

Luk 21:1-4 KJV And he looked up, and saw the rich men casting their gifts into the treasury. [v. 2] And he saw also a certain poor widow casting in thither two mites. [v. 3] And he said, Of a truth I say unto you, that this poor widow hath cast in more than they all: [v. 4] For all these have of their abundance cast in unto the offerings of God: but she of her penury hath cast in all the living that she had.

The parallel verses in Matthew 12:41-44 also says two coins, and that they both made a farthing:-

Mar 12:41-44 KJV And Jesus sat over against the treasury, and beheld how the people cast money into the treasury: and many that were rich cast in much. [v. 42] And there came a certain poor widow, and she threw in two mites, which make a farthing. [v. 43] And he called unto him his disciples, and saith unto them, Verily I say unto you, That this poor widow hath cast more in, than all they which have cast into the treasury: [v. 44] For all they did cast in of their abundance; but she of her want did cast in all that she had, even all her living.