Problem Solving (PS) | Re: Prof. G and Prof. R met at a conference. Prof. G told Prof. R

Prof. G and Prof. R met at a conference. Prof. G told Prof. R, " I found out that your teaching experience is twice that of mine." Prof. R replied in the affirmative. Prof. G continued, "But last time when both of us came to the same conference, I remember that your teaching experience was thrice that of mine." " That was two years ago," Prof. R said. How many years has Prof. Gupta been teaching?

A. 3
B. 4
C. 5
D. 7
E. 9

(adapted
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