The average age of a teacher and $25$ students is $17$ years. If the teacher’s age is excluded, the average reduces by $2$ years. The age of the teacher is :

The average score of boys in an examination of a school is $71$ and that of girls is $73.$ The average score of the school in that examination is $71.8$. Find the ratio o...

A boat’s speed in still water is $6 \; \text{km/hr.}$ while river is flowing with speed of $1.2 \; \text{km/hr.}$ and it takes $1$ hour to row to a place and back. How ...

One morning after sunrise, Soni, while going to school met Priya at a road crossing. Priya's shadow was exactly to the right of Soni. If they were face to face, which dir...