Five digits 2, 3, 5, 7 and 9 are to be arranged in a row. Digit 9 is to the left of digit 5. Digit 2 is to the right of digit 7 and left of digit 9. Digit 5 is to the left of digit 3. Which digit is in the middle of the row?

How many people are there in a group standing in a straight line, given that A and E are at the two ends and there are exactly 3 people between them?

A certain number of people are sitting in a row, facing North. Only eight people sit between R and P. Only two people sit to the left of Q. R sits third to the right of T. Only four people sit between P and Q. Only two people sit to the right of V. Only six people sit between T and V. If no other person is sitting in the row, then what is the total number of people seated?