Seven persons S, E, V, B, A, D, and U sit in a row facing north. Each has different work experience in years: 15, 7, 2, 23, 19, 6, and 12. The followi...

Seven persons S, E, V, B, A, D, and U sit in a row facing north. Each has different work experience in years: 15, 7, 2, 23, 19, 6, and 12. The following conditions apply:

• Persons with vowel names have even years of experience and do not sit at either end or exactly in the middle.
• Three persons sit between S and the person with 23 years of experience.
• One person sits between S and A.
• The number of persons to the right of A equals the number of persons to the left of the person whose experience is 2.5 times that of A.
• B neither has the highest experience nor sits next to S.
• The person with the least experience sits second to the left of D.
• U does not have the least experience.
• Both neighbors of B have more experience than B.

Question: How many persons sit to the right of the one having 1 year less experience than B?