Adolescents are generally grouped in the age-group of _____________.
Adolescents – young people between the ages of 10 and 19 years – are often thought of as a healthy group.
The following histogram shows the data concerning age in years of workers in a factory.
How many workers are in the age group of 17-19?
In 10 years, A will be twice as old as B was 10 years. ago. If A is now 9 years older than B, the present age of B is: