In a family of four members there is father, mother, son and daughter. When sorted according to decreasing order of their ages, the order is father, mother, son and daughter. The difference between the age of father and mother is $5$ years. The difference between total age of male members and female members is $15$ years. Also, the total age of children is $20$ years, then the age of the son is _____.

Find the values of W, X, Y and Z in the given figure sum of numbers vertically, horizontally and diagonally is equal $45$.

The yearly percentage expenditure of a school student on various items is shown in table given below:

$\begin{array}{|lc|}\hline \text{ Items }& \text{ Expenditure }\\ \text{ Books }& 30\\ \text{ Note Books }& 10\\ \text{ School fee }& 20\\ \mathrm{Mess} \mathrm{charges}& 5\\ \mathrm{Travel} \mathrm{and} \mathrm{accomodation}& 35\\ \hline\end{array}$

Which of the following figures represent the above data?

The ratio of boys and girls in a school for the last five academic years are given in the following graph. If the number of girls in $2016-17$ is half of that in $2017-18$, what is the ratio of boys in $2017-18$ to boys in $2016-17?$

A manufacturer of tennis balls is claimed that their balls are the best as it (a ball) would rise constantly $10\%$ of the height from which it was dropped.

If the ball is dropped from $27$ feet, how much approximately in feet the ball travels (in feet) before coming to rest?

Aman is six years elder than Ayaz.

Ayaz is eight years elder than Ashwinder.

The sum of the present ages of Aman and Ayaz is five times the age of Ashwinder four years ago.

Then the present age of Aman is :