The present age of Ramesh is $x$ years. Mahesh is $5$ years elder than Ramesh and three years younger than Suresh. The present age of Suresh is $\ldots \ldots \ldots \ldots$

If in a rectangle,the length is increased and breadth reduced each by $2$ units,the area is reduced by $28$ square units. If,however,the length is reduced by $1$ unit and the breadth increased by $2$ units,the area increases by $33$ square units. Find the area of the rectangle.

In cyclic quadrilateral $ABCD$,$m \angle A = 2x + 4$,$m \angle B = y + 3$,$m \angle C = 2y + 10$,and $m \angle D = 4x - 5$. Find the measures of all four angles.

For a pair of equations $13x - 7y = 19$ and $7x - 13y = 31$,find the value of $x + y$.

Five years ago,the sum of the ages of a father and two sons was $x$ years. Then,after five years,the sum of the ages of all will be $\ldots \ldots \ldots$ years.

Find the value of $k$ under the given condition for the following pair of linear equations: $2x - 3y = 1$ and $kx + 5y = 7$,such that the system has a unique solution.