Helen paid $252 for a conference ticket. If she had purchased the ticket one day later, she would have paid $306. How many days in advance did she purchase the ticket?
(A) 5 (B) 30 (C) 59 (D) 60 (E) 89
inital price of ticket and no of days is all unknown plus if we let 2 variables unable to solve it
initial price of ticket=x
no of days since initial days =n
so now
x+54n=252 &
x+54(n+1)=306
both giving same equation