Pamela is 12 years older than her brother. Last year, she was thrice as old as her brother. How old is Pamela now?
P = B+12
(P-1) = 3(B-1)
P-1 =3B-3
substitute for P using first equation
B+12-1 =3B -3
14 = 2B
B = 7
P = 19
last year they were 6 and 18.