If 63+25=12, 21+27=16 and 42+29=20, then 51+31=??

Explain??

• => 63+25=12 ( 9+7=16-4=12 )
  => 21+27=16 ( 3+9=12+4=16 )
  => 42+29=20 ( 6+11=17+3=20 )
  => 51+31=?? ( 6+4=10+4=24 )
  => 51+31=24
  => Ans : 24
• 12 years agoHelpfull: Yes(0) No(2)
• @ Raja,
  
  It's wrong.
  There is no logic..
• 12 years agoHelpfull: Yes(0) No(0)
• i think the answer is 24.it is increased by 4. 12,16,20,24.
• 12 years agoHelpfull: Yes(0) No(0)