4) What is the value of $6a$ if $3a-2=2b-1$?
(A) $4b+1$
(B) $4b+2$
(C) $4b+3$
(D) $4b+4$
(E) none of the above.
4) The answer is $(\mathrm{B})$

Indeed $2(3 a-2)=2(2 b-1)$, which gives $6 a-4=4 b-2$, that is $6 a=4 b+2$.