From the pair of linear equations in the following problems and find their solutions (if they exist) by elimination method : I am three times as old as my son. Five year later, I shall be two and a half times as old as my son. How old am I and how old is my son ?

Form the pair of linear equations in the following problems, and find their solutions (if they exist) by the elimination method : Five years ago, Nuri was thrice as old as Sonu. Ten years later, Nuri will be twice as old as Sonu. How old are Nuri and Sonu ?

Form the pair of linear equations in the following problems and find their solution by substitution method : Five years ago, I was thrice as old as my son and ten years later I shall be twice as old as my son. How old are we now ?

From the pair of linear equations in the following problems and find their solutions (if they exist) by elimination method : There are rs 2 and rs 5 coins in a purse. If there are 60 coins of value rs 195, find the number of coins of each kind.

From the pair of linear equations in the following problems and find their solutions (if they exist) by elimination method : The ages of two friends A and B differ by 3 years, A's father D is twice as old as A, and B is twice old as his sister C. The ages of C and D differ by 30 years. Find ages of A and B if A is elder than B.

From the pair of linear equations in the following problems and find their solutions (if they exist) by elimination method : 2 men and 5 women can do a piece of work in 4 days. While 4 men and 4 women can finish it in 3 days. How long would it take 1 man to do it ? How long would it take 1 woman to do it ?

From the pair of linear equations in the following problems and find their solutions (if they exist) by elimination method : If a room were 2 m longer and 3 m broader then its area would have increased by 75 sq. m. If it were one metre shorter and 2 metres broader, the area would have increased by 16 sq.m. find its lenght and breadth .

Form the pair of linear equations in the following problems and find their solution by substitution method : Ten years ago, father was twelve times as old as his son and ten years hence he will be twice as old as his son will be. Find their present ages.

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.

From the pair of linear equations in the following problems and find their solutions (if they exist) by elimination method : Seven times a given two digit number is equal to four times the number obtained by interchanging the digits and the difference of digits is 3. Find the number