What is the missing number?
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 45
The first user who solved this task is Thinh Ddh.
#brainteasers #math #riddles
Edison patentIn 1909, a U.S. patent for "Waterproofing Paint for Portland Cement Buildings" was issued to Thomas A. Edison (No. 909,167) and another for "Waterproofing Paint for Portland Cement Structure" (No. 909,169). He also received a patent for "Waterproofing Fibers and Fabrics" (No. 909,806). |