What is the MM Size for Drain Plugs?

How many millions to 2000000000? What date of birth is mcmLI in Roman numerals? How many days is 3 less than 4 weeks? She loves to solve clues and maybe she can solve you one of these days? What is the turning point in The Devil's Arithmetic? What is 4 sixteens as a decimal? What is y equals 3x - x - 2? What is 25 centimeters x 20 centimeters? What does each letter in maths stand for? How many ft are in 6 in? What special quadrilateral has diagonals that bisect each other but no right angles? What does positive two plus negative three equal? What does unit rate mean as a ratio? What is the opposite number from -4? What is the difference between discretely and discreetly? How much is 20 percent of 18.50? How many edges does a trapezium prism have? What is Mar's mass in scientific notation? What are the common factors of 16 and 192? What is a customary signature?