Question

How many intergers between 1 and 500 inclusive are divisible by both 6 and 9 but not 4

Answer 1

I think the answer is 14.
the smallest common multiple of 6 and 9 is 18. all multiples of 18 is divisible by 6 and 9. 
500 ÷18=27.777777777
there are 27  numbers between 1 and 500 that are divisible by both 6 and 9, but when the quotient is an even number, the multiple of 18 is divisible by 4 as well, so only the multiples of 18 that produce an odd quotient satisfy the requirement.
from 1 to 27, there are 14 odd numbers.