I want to know the answer to the following question:
How much did Charles B. Johnson pledge to Yale in 2013?
All the background I'm provided with is that "Among those who have made large donations commemorated at the university are: Elihu Yale; Jeremiah Dummer; the Harkness family (Edward, Anna, and William); the Beinecke family (Edwin, Frederick, and Walter); John William Sterling; Payne Whitney; Joseph E. Sheffield, Paul Mellon, Charles B. G. Murphy and William K. Lanman.". Is that enough to answer the question?
Answer: no