How many numbers are there from 1 to 60, which are divisible by 3 and either unit digit or tenth digit or both include 3?

If following numbers are written in descending order then what will be middle digit of middle term?

723, 789, 595, 659, 713, 785, 689

How many $6$’s are there in the following number series which are preceded by $5$ but not followed by $7$?

$56765649276743568649567$

How many 3’s are there in the following series, which are not preceded by an odd number but followed by 4?

1 5 3 2 3 4 6 5 3 4 7 8 3 4 9 2 3 4 5 6 3 4 3 5 3 4

How many B's are there in the following letter series, which are followed by G and the G is not be followed by S?

B G S Q B R N O B G N S Q L T B G Q T D B G U W X B G F