Riddle: Mary was working in a chemistry lab with a mixture of chemicals that was 90% water and weighed 20 pounds. After returning to the lab from a weekend break, she calculated the mixture was now 50% water. How much does the mixture now weigh? For purposes of this puzzle, assume the non-water part of the mixture was not affected by evaporation.
Answer:

12 Pounds

SHARE
Share:
The Chemistry lab  Riddle Meme.
The Chemistry lab Riddle Meme.
Halloween Riddles are hand picked Halloween Riddles for use by teachers in the classroom and for home school lessons. This halloween riddles quiz provides the option to be downloaded as a PDF or printable directly from the Halloween Riddles quiz page.
Thanksgiving Riddles are hand picked Thanksgiving Riddles for use by teachers in the classroom and for home school lessons. This thanksgiving riddles quiz provides the option to be downloaded as a PDF or printable directly from the Thanksgiving Riddles quiz page.
Christmas Riddles are hand picked Christmas Riddles for use by teachers in the classroom and for home school lessons. This christmas riddles quiz provides the option to be downloaded as a PDF or printable directly from the Christmas Riddles quiz page.