How to figure out the pattern , filling in the blank

Solve this problem! extra ! 3025/5.5 = a/90.75

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

Atown recently dismissed 5 employees in order to meet their new budget reductions. the town had 5 employees over 50 years of age and 19 under 50. if the dismissed employees were selected at random, what is the probability that exactly 2 employees were over 50? express your answer as a fraction or a decimal number rounded to four decimal places.