Linear equation
An equation involving only one unknown variable is called a linear equation.
Solution of a linear equation
The value of the unknown variable which when substituted, satisfies the given equation is called the solution of the equation.
Guide lines to solve Age problems
  1. Read the problem carefully and denote the unknown age by some variable x.
  2. Convert the statements of the problem step-by-step into mathematical equations, to the extent possible
  3. Solve the equations for the unknown.
  4. Check whether the obtained value of the variable satisfies the conditions given in the problem