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As is supported by evidence recently presented in mathematical symposia, mathematicians are discovering more and more unsolved problems, nearly twice as many as confounded mathematicians of the 1950s.
a. twice as many as confounded
b. double the number of problems that confounded
c. two times the problems as confounded the
d. twice as many as the problems that confounded
e. double the problems that confounded
OA A
Source: Princeton Review
a. twice as many as confounded
b. double the number of problems that confounded
c. two times the problems as confounded the
d. twice as many as the problems that confounded
e. double the problems that confounded
OA A
Source: Princeton Review
