Eight iterations in, Mario Kart has become something of a known quantity.
After 30 years of tumult in Egypt, first under Gamal Abdel Nasser and then Anwar Sadat, Cairo became a known quantity.
Getting hold of a known quantity is one thing, but—as evidenced by the results thus far—making it work is another.
Bill Cosby was already a known quantity when The Cosby Show began in 1984.
But a negative that high is frightening for a known quantity.
The finely-divided substance containing the dioxide is digested in a solution of a known quantity of iron in sulphuric acid.
I should thus get the half weight of my body—a known quantity, you will recollect.
These tanks are filled with water and a known quantity of slaked lime.
The individual with the point of view must, of course, be a known quantity.
The temper of Lady Dawlish is a known quantity, and the quality of it is alarming.