What in one less than a score?

What is the whole number of 18.16? What do you need to take away from -10 to get 3? How many years equal two centuries? Is the square root of 28 integral or imaginary? What is -0.9 x 0.2? How big is 30 sq ft? What is the equivalant fraction of one half? What purpose do key signatures serve? Why can't prime numbers be simplified? What is ten fourtyth in simplest form? Is 1.0 equals to 1.00? What is the product of all the prime numbers between 1-100? Can corresponding sides be different lengths? What is 3 percent of 23500? What times 5 equals 50? What is the meaning of clock and 10.10 in Hindi? What is impersonal form? How do you write 10.285? What does 30dBm plus 30dBm equal? What is 77 divided by 10?