You're interviewing 100 subjects about their birth dates. For example, if the birth date is April 14, 1994, it will be recorded as 14/4/1994.

There are 52 people who have odd birth date numbers, 54 with odd month numbers, and 60 with odd year numbers. On the other hand, there are 20 people who have even birth date & month numbers, 17 with even month & year numbers, and 15 with even date & year numbers.

If there are 11 people who have all odd day, month, year numbers, how many people have all even day, month, year numbers?

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