OK, in order to know the remainder..we need to make sure that the statement provide us enuff info to compare with the question stem..
we are asked with is the remainder when X is divided by 8..well 8 has 3 2s..right!
OK statement 1) says X divided by 12 remainder is 5..well...we know that 12 has 2 2s..which is not the same as having 3 2s...so this statement is going to be insuff..
OK statement 2) says x divided by 18, remainder is 11...well 18 again has only 1 2 as a prime factor..again we need some number that has 3 2s...to conclusively anything..so Insuff
combined..again we dont know if the X has 3 2s or not..insuff..
could u explain ur explanation in detail? I dont know the rule of primes in this case.