Beach Day by Rodger Bliss
May 2024

Chemical Solution

One of our workers wanted to make two identical mixtures. Each contains:
230 kg of water.
370 kg of (water soluble) chemical solution.
During making the first mixture he made a mistake. He put:
230 kg water.
470 kg of chemical solution.
How can he correct this mistake without losing any material?
These mixtures are mixed in 750 Liter containers.


When the “Donald” doesn’t think you’re carrying your weight, he looks over and says: You’re Fired! We at RiddleDude are less harsh.

Please forward a RiddleDude email to friends and family in your address book. Urge them to sign up for the daily email. Ask them to forward it to their friends. Paste us to your Facebook page!

You can best support our site—which is also YOUR site—by promoting it. is a free site and will always be a free site. We do it for the love of riddles. Remember, your comments and submissions are always welcome.


Submit your Guess




You can use these HTML tags

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>

5 guesses to Chemical Solution

    Warning: Use of undefined constant bfa_comments - assumed 'bfa_comments' (this will throw an Error in a future version of PHP) in /home/customer/www/ on line 132
  • Add 100 kg of chemical to the other solution.

  • Dude

    Nope, keep trying.

  • Big Daddy

    Add 62.16kg of water.

  • Big Daddy

    Wait (just read this more closely), since we are limited to 750kg, and since we need two identical mixtures:

    1. Pour half (350kg) of the incorrect mixture into a new empty container.
    2. Add 115kg water to each
    3. Add 135kg chemical to each

  • Dude

    You nailed it, Big Daddy.

    Divide the solution in half. Add 135kg of chem and 115kg of water to each container.

    Original solution was 600kg of 61 2/3% chemical. Mistake was 700kg 67 1/7% chemical. When you divide it, you have 350kg of 67 1/7% chemical – or 235 kg of chemical and 115kg of water. Then just make up the difference to get you back to the required amount.

    You are today’s winner.