If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father? Comment.

Present age of father is 42 years and his son 14 years.Find the ratio of: Age of father to the age of son when father was 30 years old.

From the pair of linear equations in the following problems and find their solutions (if they exist) by elimination method : If twice the son's age in years is added to the father's age, the sum is 70. But if twice the father's age is added to the son's age, the sum is 95. Find the ages of father and son.

Two years ago a father was five times as old as his son. Two years later, his age will be 8 years more than three times the age of the son. Represent this situation algebraically and graphically .

Raghav was returning with his family from a marriage party. On the way, a traffic policeman stopped their car. He asked Raghav’s father who was driving the car to exhale his breath into an instrument to check whether he has drunk or not. After checking from the instrument, he allowed them to go. As a student of chemistry: Name the instrument used by the traffic policeman.

Raghav was returning with his family from a marriage party. On the way, a traffic policeman stopped their car. He asked Raghav’s father who was driving the car to exhale his breath into an instrument to check whether he has drunk or not. After checking from the instrument, he allowed them to go. As a student of chemistry: Can you explain the theory behind this test ?

Raman went to a hospital with his father to see his uncle who was admitted there because of some health problems. The doctor asked Raman to bring a particular injection to be given to his uncle. When Raman brought the injection, the doctor asked him to get the injection changed from the chemist. Raman insisted that it was the same injection as prescribed by him and its expiry date is also next year. But the doctor explained Raman that the injection has not been expired but it was not of compatible concentration as prescribed by him. Raman felt satisfied and got the injection changed Answer the following questions: What was the reason for asking Raman to get hte injection of compatible concentration?

Present age of father is 42 years and his son 14 years.Find the ratio of: Present age of father to the present age of son.