If m/n = 5/6, then what is 3m + 2n ?

(A) 0
(B) 2
(C) 7
(D) 10
(E) it cannot be determined from the information given

not just answer

if m/n = 5/6

6m = 5n
n = 6m/5

then 3m + 2n
= 3m + 6m/5
= 21m/5

I would choose E