n = 45k+30, where K is a non-negative integer1). When divided by 45, the remainder is 30
n = 5*(9k+6) which is divisible by 5.
Sufficient to answer the question.
from the question the integer n is of the form 3k+2, where k is a non-negative integer.2). The integer is divisible by 2
If k = 6; n = 3k+2 = 20 - Divisible by 5
If k = 4; n = 3k+2 = 14 - Not divisible by 5
Insufficient to answer the question
IMO A
