Linear equations are part of all math aptitude tests. They can be age related problems, upstream, downstream problems etc
I am three times as old as my son. Five years later I shall be two and a half times as old as my son. What is my age?

• Let son's age age be 'x' so his age =3x
  
  2 1/2(x+5)=3x+5
  x=15
  So his age= 3x= 45
  
  
• 11 years agoHelpfull: Yes(4) No(1)
• M-my age
  S-son age
  present:
  M=3S
  five years later:
  2(M+5)=5(S+5)
  solving two:
  M=45
  S=15
• 10 years agoHelpfull: Yes(1) No(0)
• 3x-5=5/2(x-5)
  x=15
  3*15=45
• 10 years agoHelpfull: Yes(0) No(0)