The father's age is 15 times his son's age. After 10 years, the age of the father will be 5 times his son's age. The present ages of the son and the father are, respectively

Coin A is flipped 4 times and coin B is flipped 5 times. What is the probability that the number of heads obtained from flipping the two coins is the same?

In this diagram, the triangle represents men, the square represents engineers and the circle represents employed. Find the number of men who are employed but not engineers.