ajay patwal

• Oct 19th, 2012

 

ans= 25
bcoz, 3*3=9
3*6=18
3*7=21
5*5=25
5*4=20
so like(3*6 and 3*7 it will be 5*4 and 5*5 mens increment by 1)

JYOTHI

• Oct 17th, 2013

 

30

smitha G.V

• Mar 10th, 2014

 

ans:15
Because
3*3=9
3*6=18
3*7=21
5*5=25
5*4=20
5*3=15(i.e. in case of 3 it gets incremented in case of 5 it gets decremented)

sana

• Mar 20th, 2014

 

if v take 2 series...9,21,20..... 18,25,?
9+(3*3)=18
21+(2*2)=25
20+(1*1)=21 ans :21

roshan

• Oct 10th, 2015

 

18-9=9,
21-18=3,
25-12=3,
20-25=-5,
so from this 9+3+3+(-5)=10,
so 20+10=30

chandrashekhar

• Mar 31st, 2016

 

9*2--18,
18+3--21,
21+4--25,
25-5--20,
20-6--14

JIGAR PATEL

• Apr 2nd, 2016

 

Ans= 25
because, 3*3=9
3*6=18
3*7=21
5*5=25
5*4=20
so like (3*6 and 3*7 it will be 5*4 and 5*5 means increment by 1)

Abhigyan

• Apr 2nd, 2016

 

Answer is 14. My calculation is
9 *(1)=9
9 *(2)=18
18+(3)=21
21+(4)=25
25-(5)=20
20-(6)=14

jyoti

• Apr 8th, 2016

 

26 because 18-9=9
21-18=3
25-21=4
25-20=5
26-20=6

Nimish S Subhedar

• Apr 13th, 2016

 

9x1=9
9x2=18
18+3=21
21+4=25
25-5=20
20-6=14
Ans:14