
Well, that's a question with a silver lining, but the answer really depends on what year is stamped on those coins! Not all Kennedy half dollars were created equal in the precious metals department, so you'll need to do a little detective work first.
If you've hit the jackpot and are holding 20 Kennedy half dollars from the year 1964, you're looking at the good stuff. These coins are 90% silver, and each one contains 0.3617 troy ounces of it. A quick bit of math tells us that your 20 coins would have a grand total of about 7.234 troy ounces of silver. Not bad for ten bucks face value!
However, if your coins are dated between 1965 and 1970, they were made with a more modest 40% silver. They still have some precious metal value, but significantly less than their 1964 counterparts.
And if your 20 half dollars are from 1971 or any later year (aside from some special silver proof sets for collectors), I hope you weren't an early retirement. Most modern Kennedy half dollars contain absolutely no silver at all. So, the total amount of silver in those would be a round zero. They are, however, still worth fifty cents each


