1+2+3+(4)=10 2+3+4+(4)=13 4+5+6+(4)=19 5+6+7+(4)=22 similarly. 6+7+8+(4)=25 hence 25 is the ans..

since in 1+2+3=10 (1+2+3+4(add extra four) ) similarly 2+3+4=13 (2+3+4+4(add extra four) ) 4+5+6=19 (4+5+6+4(add extra four) ) 5+6+7=22 (5+6+7+4( add extra four) )

hence 6+7+8=25(6+7+8+4(add extra four) )

Answer is 25 since (1+2+ 3)+ 4=10 (2 +3+ 4)+ 4=13 (4 +5+ 6)+ 4=19 (5 +6+ 7)+ 4=22 then (6 +7+ 8)+ 4=25

6+7+8=21+4=25

answer will be 25

Logic 4 is hiden so 6 + 7 + 8 + 4= 25

Ans is 25.............increment each ans by 3 that set...........so easy

6+7+8 + (4) = 25

add 4 hence ans=25

If 5 + 4 => 9 3 + 5 => 9 9 + 1 => 9 1 + 6 => 8 4 + 2 => 8 1 + 7 => 7 5 + 6 => 6 3 + 7 => 3 7 + 0 => 0 Then 8 – 1 => ??